Relationship between Root Characteristics of Peanut in Hydroponics and Pot Studies

Girdthai, Teerayoot; Jogloy, Sanun; Kesmala, Thawan; Vorasoot, Nimitr; Akkasaeng, C.; Wongkaew, Sopone; Holbrook, C. Corley; Patanothai, A.

doi:10.2135/cropsci2008.09.0529

Cited by 22 publications

(17 citation statements)

References 24 publications

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“…These results agree with previous findings on groundnut (Teerayoot et al 2010;Ntare and Williams 1998). These results indicate that screening for drought tolerance in groundnut is specific to the drought conditions that are imposed, which agree with recent results in a wide array of germplasm from the reference collection of groundnut (Hamidou et al under review).…”

Section: Discussionsupporting

confidence: 93%

Groundnut (Arachis hypogaea) genotypes tolerant to intermittent drought maintain a high harvest index and have small leaf canopy under stress

Ratnakumar

Vadez

2011

Functional Plant Biol.

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Experiments were conducted in lysimeters to assess root development, water uptake, transpiration efficiency, yield components, and their relationships, in twenty groundnut genotypes under well watered (WW) and mild (DS-1), medium (DS-2), and severe (DS-3) intermittent stress until maturity. Pod yield decreased 70%, 55% and 35% under severe, medium and mild stress, respectively, compared with WW conditions. Pod yield varied among genotypes, and showed highly significant genotype-by-treatment effects.Root length density (RLD) varied among genotypes before and after stress imposition, although RLD did not discriminate tolerant from sensitive lines. Total water uptake and root length density (RLD) under water stress had a significant but weak relationship.Water extraction from the soil profile (total water uptake minus irrigation water), was the highest under the severe stress. Water uptake varied largely among genotypes in all water regimes, but correlated to pod yield under WW conditions only. The relative harvest index, i.e. the ratio of the harvest index under stress to that under WW conditions, was closely related to the pod yield in all three intermittent stresses (R 2 = 0.68 in DS-1; R 2 = 0.65 in DS-2; R 2 = 0.86 in DS-3), and was used as an index of stress tolerance. Under medium and severe stresses, the relative harvest index was negatively related to plant leaf weight (R 2 = 0.79 in DS-2; R 2 = 0.53 in DS-3), but less so under mild stress (R 2 = 0.31).Results suggest that under an intermittent stress, genotypes with lower leaf area may use water more sparingly during drying cycle with less damaging consequences for reproduction and pod development than genotypes having larger leaf area.Additional Keywords: groundnut, water deficit intensities, water uptake, root characteristics, pod yield, lysimetric system Introduction Intermittent water stress occurs in crops that are planted during the rainy season and where gaps in rainfall can expose plants to water stress at any time during the cropping cycle, with possible variation in the timing, the intensity and the duration of the associated water deficits (Serraj et al. 2005). Groundnut typically experiences a range of intermittent stresses and yields are affected when the stress occurs at both vegetative and reproductive phases (Rahmianna et al. 2004). Yield is then highly dependent on the stage when the stress occurs and the available water to the crops at that stage (Ratnakumar et al. 2009).From a breeding point of view, knowing whether different stress intensities would affect groundnut yield differently is also critical to set the screening conditions according to those in the targeted environment, and it is of major interest for this present work.Indeed, even if exposed to an intermittent stress that follows the same frequency during the same phenological period, the intensity of the stress can vary a lot depending on how much water is received each time the stress is relieved by rainfall. Therefore, while selecting for lines adapted to an intermittent s...

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Section: Discussionsupporting

confidence: 93%

Groundnut (Arachis hypogaea) genotypes tolerant to intermittent drought maintain a high harvest index and have small leaf canopy under stress

Ratnakumar

Vadez

2011

Functional Plant Biol.

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“…The difference of genotypes stem weight under water stress compared to well water conditions suggested that drought tolerance may be adaptive since its important role in accumulation of assimilates storage for vegetative growth and grain filling. These results agree with findings on groundnut reported by several authors [15,16,17].…”

Section: Resultssupporting

confidence: 94%

Leaf Conductance Study on Twelve (12) Genotypes of Sorghum [Sorghum bicolor (L.) Moench]

Toure

Touré

Diallo

et al. 2019

IJPSS

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Enhancing transpiration efficiency (TE), defined as biomass accumulation per unit water transpired, may be an effective approach to increasing sorghum yield in arid and semi-arid regions under drought conditions. Water use efficiency was compared among 12 sorghum cultivars collected from the ICRISAT Genebank and representing diverse origins. Plants were cultivated in a split plot experimental design using pots with two factors in 5 replications. An irrigation system with two levels: the "well water”, and “water stress” were applied. Plastic bags were used to wrap the pots after the phase of water saturation. Transpiration Efficiency (TE) was used to evaluate the performance of a genotype in water deficit conditions. The parameters such as leaf weight, stem weight and root weight were measured and the data were analyzed using the statistical software tool GenStat version 19. Leaf weight, stem weight and root weight varied significantly between genotypes under well water conditions while under water stress conditions only the stem weight measured was significantly different among the genotypes. Significant differences between genotypes for leaf canopy conductance were found. The leaf canopy conductance was weakly correlated to the stem weight and root weight in both well-watered and water stress conditions.

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“…Resultados similares foram ralatados por Mian et al (1993), em que o crescimento radicular vigoroso resultou em crescimento vigoroso da parte aérea do trigo, por Girdthai et al (2010), em amendoim, e por Kennedy & Hutchinson (1999), em algodão. Isso leva a crer que a cultura tende a manter equilíbrio na sua relação raiz/parte aérea; a ocorrência de prejuízos em um dos fatores será acompanhada de redução do outro fator.…”

Section: Resultsunclassified

Crescimento inicial e absorção de nutrientes pelo algodoeiro cultivado sobre a palhada de Brachiaria ruziziensis

Echer¹,

Castro²,

Bogiani

et al. 2012

Planta daninha

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RESUMO -As gramíneas forrageiras possuem alta capacidade para produzir palha no sistema de semeadura direta em integração lavoura-pecuária. No entanto, essas plantas podem reduzir o crescimento das culturas, em função de efeitos alelopáticos ou pela competição por nutrientes. O objetivo deste trabalho foi avaliar o efeito de resíduos culturais de Brachiaria ruziziensis no crescimento inicial e no acúmulo de nutrientes na parte aérea do algodoeiro, quando foram deixados sobre o solo ou no solo. O experimento foi conduzido em casa de vegetação, sendo o algodão cultivado com os tratamentos: raízes e parte aérea da braquiária cultivada previamente e deixadas no vaso; parte aérea da braquiária colocada sobre o solo; raízes da braquiária ficaram no solo, mas a parte aérea foi retirada; uma testemunha (sem braquiária). As raízes de braquiária remanescentes no solo causaram diminuição na produção de matéria seca da parte aérea e no crescimento inicial das raízes do algodoeiro. O teor e o acúmulo de N na parte aérea da planta foram menores na presença de raízes de braquiária, porém o teor de P na parte aérea do algodoeiro foi maior, e tanto o teor como o acúmulo de K na parte aérea do algodão foram maiores quando este foi cultivado sobre resíduos da parte aérea da braquiária. Palavras-chave:Gossypium hirsutum, crescimento radicular, rizotron, sistema plantio direto, palhada. ABSTRACT -Grasses have a high ability to produce straw under no

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Relationship between Root Characteristics of Peanut in Hydroponics and Pot Studies

Cited by 22 publications

References 24 publications

Groundnut (Arachis hypogaea) genotypes tolerant to intermittent drought maintain a high harvest index and have small leaf canopy under stress

Groundnut (Arachis hypogaea) genotypes tolerant to intermittent drought maintain a high harvest index and have small leaf canopy under stress

Leaf Conductance Study on Twelve (12) Genotypes of Sorghum [Sorghum bicolor (L.) Moench]

Crescimento inicial e absorção de nutrientes pelo algodoeiro cultivado sobre a palhada de Brachiaria ruziziensis

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