Paddy Chlorophyll Concentrations in Drought Stress Condition and Endophytic Fungi Application

Syamsia, Syamsia; Idhan, Abubakar; Noerfitryani,; Nadir, Marhamah; Reta, Reta; Kadir, Muhammad

doi:10.1088/1755-1315/156/1/012040

Cited by 16 publications

(9 citation statements)

References 14 publications

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“…Our study showed a general increase in SPAD index in response to increasing stress levels across most cultivars (Figure S1). Several studies reported a decline in SPAD readings in response to drought [28,29,30,31]. However, our study also demonstrated there was a delay in heading with increasing water stress, suggesting a decrease in sink demand, delayed remobilization of carbohydrates to the grain and delayed leaf senescence (Table S10).…”

Section: Discussionsupporting

confidence: 62%

Physiological and Metabolic Responses of Rice to Reduced Soil Moisture: Relationship of Water Stress Tolerance and Grain Production

Barnaby

Rohila

Henry

et al. 2019

IJMS

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Access to adequate irrigation resources is critical for sustained agricultural production, and rice, a staple cereal grain for half of the world population, is one of the biggest users of irrigation. To reduce water use, several water saving irrigation systems have been developed for rice production, but a reliable system to evaluate cultivars for water stress tolerance is still lacking. Here, seven rice cultivars that have diverse yield potential under water stress were evaluated in a field study using four continuous irrigation regimes varying from saturation to wilting point. To understand the relationship between water stress and yield potential, the physiological and leaf metabolic responses were investigated at the critical transition between vegetative and reproductive growth stages. Twenty-nine metabolite markers including carbohydrates, amino acids and organic acids were found to significantly differ among the seven cultivars in response to increasing water stress levels with amino acids increasing but organic acids and carbohydrates showing mixed responses. Overall, our data suggest that, in response to increasing water stress, rice cultivars that do not show a significant yield loss accumulate carbohydrates (fructose, glucose, and myo-inositol), and this is associated with a moderate reduction in stomatal conductance (gs), particularly under milder stress conditions. In contrast, cultivars that had significant yield loss due to water stress had the greatest reduction in gs, relatively lower accumulation of carbohydrates, and relatively high increases in relative chlorophyll content (SPAD) and leaf temperature (Tm). These data demonstrate the existence of genetic variation in yield under different water stress levels which results from a suite of physiological and biochemical responses to water stress. Our study, therefore, suggests that in rice there are different physiological and metabolic strategies that result in tolerance to water stress that should be considered in developing new cultivars for deficit irrigation production systems that use less water.

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Section: Discussionsupporting

confidence: 62%

Physiological and Metabolic Responses of Rice to Reduced Soil Moisture: Relationship of Water Stress Tolerance and Grain Production

Barnaby

Rohila

Henry

et al. 2019

IJMS

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“…Further investigations are needed to determine the protein types and sources. Proteins play an important role in the growth and nutritive value of plants and can mediate the production of antioxidants [72]. The fatty acids' contents did not vary significantly (p > 0.05) among conidial concentrations.…”

Section: Discussionmentioning

confidence: 89%

Evaluating the Endophytic Activities of Beauveria bassiana on the Physiology, Growth, and Antioxidant Activities of Extracts of Lettuce (Lactuca sativa L.)

Macuphe

Oguntibeju

Nchu

2021

Plants

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Endophytic entomopathogens have growth promoting, nutrient fortifying, and anti-insect properties that could improve the yield and quality of lettuce (Lactuca sativa L.). Lactuca sativa is a vegetable crop with high demand; however, it is susceptible to aphid infestations. This study’s objectives were to assess the pathogenicity of Beauveria bassiana (strain: SM3) (Bals.) Vuil. (Hypocreales) against Myzus persicae Sulzer, tissue colonization of lettuce by conidia of B. bassiana, as well as the effects of fungal inoculation on growth, tissue nutrient content, and proximate composition of the lettuce plants. Furthermore, the involvement of tissue nutrients in mediating the influence of endophytic fungus on the plant traits was examined. Insects and plants were exposed to four fungal conidial concentrations: 0, 1 × 106, 1 × 107 and 1 × 108 conidia mL−1 in an anti-insect bioassay and a greenhouse experiment, respectively. The B. bassiana strain was pathogenic against M. persicae, inducing mean insect mortality of 78% at the highest concentration (1 × 108 conidia mL−1). The B. bassiana endophytically colonized up to 76% of plants exposed to 1 × 108 conidia mL−1. Crown size and plant height varied significantly among treatments. However, the plant fresh and dry weights and nutrient elements N, P, K, Ca, and Mg did not vary significantly among treatments. Among the plant macronutrients assessed, only tissue carbon content was significantly (p < 0.01) affected by conidial treatments. The tissue C and Cu contents significantly correlated with the antioxidant capacity of the lettuce plants. Most of the micronutrients, viz. Mn, Fe, Cu, and B were remarkably higher (p < 0.05) in the fungus-treated plants than in the control plants. The antioxidant capacity (FRAP and TEAC) of plant extracts varied significantly (p < 0.001) among treatments, with the highest conidial treatment yielding the most increased antioxidant activity. In conclusion, the B. bassiana strain was endophytic to lettuce, pathogenic against M. persicae, and induced increased micro-nutrient tissue contents and antioxidant activities. This study demonstrated that B. bassiana could be potentially used in the biofortification of nutritive and medicinal qualities of plants.

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“…Hlorofila koncentrācijas izmaiņas norāda uz fotosintēzes intensitāti. Hlorofila zudumi ir negatīvas vides stresu izraisītas sekas (Khayatnezhad, Gholamin, 2012;Syamsia et al, 2018). Fotosintēzes sistēma II (FS II) ir ļoti jutīga uz vides faktoru ietekmi, sausuma stresa ietekmē tiek nodarīti bojājumi FS II reakcijas centriem (Khayatnezhad, Gholamin, 2012;Syamsia et al, 2018).…”

Section: Abiotiskie Faktoriunclassified

“…Hlorofila zudumi ir negatīvas vides stresu izraisītas sekas (Khayatnezhad, Gholamin, 2012;Syamsia et al, 2018). Fotosintēzes sistēma II (FS II) ir ļoti jutīga uz vides faktoru ietekmi, sausuma stresa ietekmē tiek nodarīti bojājumi FS II reakcijas centriem (Khayatnezhad, Gholamin, 2012;Syamsia et al, 2018). Hlorofila satura samazināšanos sausuma stresa apstākļos uzskata par tipisku pigmenta fotooksidāciju.…”

Section: Abiotiskie Faktoriunclassified

“…Hlorofila fluorescences analīze/mērījumi ir informatīvs rādītājs, kas ļauj spriest par fotosintētiskā aparāta `veselības līmeni`, tas nodrošina ātru un precīzu kopainu par augu mijiedarbību ar apkārtējās vides apstākļiem un noturību pret stresu (Hailemichael et al, 2016). Augsts hlorofila un karotinoīdu līmenis saistīts ar augu stresa izturību (Syamsia et al, 2018). Novērots, ka pēc spēcīgākām lietusgāzēm palielinās hlorofilu saturs, tomēr, ja augsnē ūdens saturs ilgstoši ir par daudz, tad samazinās hlorofilu daudzums (Khayatnezhad, Gholamin, 2012).…”

Section: Abiotiskie Faktoriunclassified

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Agroekoloģisko faktoru ietekme uz reti audzētu dārzeņu ražu un kvalitāti = Influence of agroecological factors on the yield and quality of rarely-grown vegetables

Zeipiņa¹

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Zeipiņa S. (2021) Influence of agroecological factors on the yield and quality of rarely-grown vegetables. The Doctoral Thesis. Latvia University of Life Sciences and Technologies. Jelgava, LLU 130 p. The research was carried out from 2013 to 2019 in the Institute of Horticulture (LatHort). The aim: to evaluate the influence of agroecological factors on the rarely-grown vegetables yield and quality on three morphological different species: stinging nettle (Urtica dioica L.), globe artichoke (Cynara cardunculus L. var. scolymus) and vegetable soybean (Glycine max L.). The tasks of the research: • to evaluate the growth and development of stinging nettle, globe artichoke and vegetable soybean under various agrotechnical factors and meteorological conditions; • to evaluate the influence of various agrotechnical factors and meteorological conditions on the yield of selected vegetables; • to determine and evaluate the nutritional value changes under various agrotechnical factors and meteorological conditions. Work novelty: for the first time in Latvia the investigations on the influence of agroecogical factors on stinging nettle, globe artichoke and vegetable soybean are performed. All these vegetables have high potential for the healthy human diet. Work hypothesis: ensuring suitable agrotechnical factors and reducing effect of meteorological conditions can increase studied vegetables yield and the content of biologically active compounds. Scientific actuality of work: obtained results are important and useful for commercial vegetable producers, the research gives insight in the yield formation and crop quality changes under various agrotechnical factors and meteorological conditions. The structure of the Thesis: introduction, literature review, materials and methods of the research, results and discussion, conclusions, references and appendix. Introduction. Topicality of the work is justiefied, research goal and tasks are formulated, research novelty and hypothesis are estimated. The list of author`s scientific publications on the topic of Thesis is provided. A literature review is arranged into 10 sub-chapters, where the main biological active compounds in investigated vegetables are described, as well as influence of agroecological factors on their content, the growth, development, and yield formating of vegetables is studied. Also, the biology, economic importance, nutritional value, growing conditions, and influence of agroecological factor on the growth, development, yield and content of biologicaly active compounds is described for selected vegetables. Materials and methods of the research are arranged into 5 sub-chapters, wehere the methodology of the research, meteorological conditions, measurements, methods of biochemical analyses and statistics are described. Results and discussion are arranged into 8 sub-chapters, where yield and changes of biologically active compounds are analysed for stinging nettle, globe artichoke and vegetable soybean under influence of various agroecological factors. Conclusions give answers on the tasks highlighted for promotion thesis. References consist on bibliographic description of the sources of information used. Appendix describe research materials and results. Work contains of 68 figures, 10 tables, 4 annexes and 268 bibliography items.

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Paddy Chlorophyll Concentrations in Drought Stress Condition and Endophytic Fungi Application

Cited by 16 publications

References 14 publications

Physiological and Metabolic Responses of Rice to Reduced Soil Moisture: Relationship of Water Stress Tolerance and Grain Production

Physiological and Metabolic Responses of Rice to Reduced Soil Moisture: Relationship of Water Stress Tolerance and Grain Production

Evaluating the Endophytic Activities of Beauveria bassiana on the Physiology, Growth, and Antioxidant Activities of Extracts of Lettuce (Lactuca sativa L.)

Agroekoloģisko faktoru ietekme uz reti audzētu dārzeņu ražu un kvalitāti = Influence of agroecological factors on the yield and quality of rarely-grown vegetables

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