Morpho-anatomical and micromorphometrical evaluations in soybean genotypes during water stress

Stolf, Renata; Medri, Moacyr Eurípedes; Pimenta, José Antônio; Boeger, Maria Regina Torres; Dias, J. D. Santos; Lemos, N. G.; Oliveira, M. C. N. de; Brogin, Rodrigo Luis; Yamanaka, Naoki; Neumaier, N.; Farias, José Renato Bouça; Nepomuceno, Alexandre Lima

doi:10.1590/s1516-89132009000600002

Cited by 12 publications

(9 citation statements)

References 19 publications

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“…Thus, in many species such as, Ctenanthe setosa and Triticum aestivum, the entire lamina and mesophyll thickness were reduced under drought stress [2][3][4][5][6][7][8][9][10][11][12][13][14], while it was unaffected by water stress in salvia spendens and Glycine max [13][14][15][16]. Bussotti et al [17] found that limited soil moisture caused a major thickening of the mesophyll, especially in the leaf cuticle and spongy parenchyma of the beech plant, Fagus sylvatica. Multiple characteristics of vascular structure have been investigated, such as modifications of the vascular bundle number and area and alteration of xylem/ phloem ratio, which are thought to be involved in the resistance of the plant to environmental stresses [18].…”

Section: Introductionmentioning

confidence: 99%

Anatomical adaptations of Astragalus gombiformis Pomel. under drought stress

et al. 2014

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The present study was designed to study the effect of drought on root, stem and leaf anatomy of Astragalus gombiformis Pomel. Several root, stem and leaf anatomical parameters (cross section diameter, cortex, root cortical cells, pith, leaf lamina and mesophyll thickness) were reduced under moderate to severe water deficit (20–30 days of withheld irrigation). The stele/cross section root ratio increased under moderate water deficit. The root’s and stems vascular systems showed reduced xylem vessel diameter and increased wall thickness under water deficit. In addition, the root xylem vessel density was increased in these drought conditions while it was unchanged in the stems. The stomata density was increased under prolonged drought conditions whereas the stomata size was untouched. The leaf vascular system showed reduced xylem and phloem tissue thickness in the main vein under moderate to severe water deficit. However, in the lamina the vascular tissue and the distance between vascular bundle were unaffected. Our findings suggest a complex network of anatomical adaptations such as a reduced vessel size with increased wall thickness, lesser cortical and mesophyll parenchyma formation and increased stomata density. These proprieties are required for the maintenance of water potential and energy storage under water stress which can improve the resistance of A. gombiformis to survive in arid areas.

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Section: Introductionmentioning

confidence: 99%

Anatomical adaptations of Astragalus gombiformis Pomel. under drought stress

et al. 2014

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“…Reducing LA is a drought avoidance strategy for the plants by reducing transpiration and avoiding low water potential which allows more water uptake (Villagra and Cavagnaro, 2006). Relative growth rate (RGR) is an efficient physiological index for comparing effects of agronomic characters (Stolf et al, 2009); RGR was high at the beginning of the experiment for the three vetch species and decreased significantly from 71-105 DWT. Indeed, in early stages, plants are in vegetative growth phase and from 91 DWT, flowering starts in V. narbonensis.…”

Section: Discussionmentioning

confidence: 99%

Agronomic performances of three vetch species growing under different drought levels

Mezni

Chaïbi

2014

Chilean J. Agric. Res.

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The current challenge of agriculture is to get the best yields while overcoming frequent water deficit conditions. The objective of this study was to compare performances of three vetch species (Vicia narbonensis L., V. sativa L., and V. villosa Roth) subjected to water stress. Plants were sown in pots under rainout shelter and submitted to four water regimes: control (100% field capacity [FC]), 80%, 60%, and 40% FC through 3 yr experiment. Results showed that V. narbonensis had the smallest declines in all the studied variables in response to water restriction but the highest water use efficiency (WUE) and stress tolerance index (STI) in both control and water-treated plants. This indicates the greater tolerance of this species to water constraint and its better water use. Vicia villosa was characterized by drastic declines in leaf area and DM yield (75% and 64%, respectively). It had also the smallest WUE and STI suggesting its low adaptation to water stress. Vicia sativa showed severe reductions in seed yield and yield components; accordingly, it was the most sensitive species in terms of seed yield. The three species implied avoidance strategies to cope with water stress. The different levels of drought tolerance explain the species ecological distribution in Tunisia.

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“…Skirycz & Inzé (2010) emphasize that under abiotic stresses plants actively re-program their growth, recover it and adapt themselves, once stress conditions become stable. These mechanisms of adaptation and stress tolerance are called by Kroon et al (2005) "plant plasticity", which may be more related to specific parts of plants, as seen in soybean (Stolf et al 2009) and in Pereskia species (Leuenberger 1992).…”

Section: Key-wordsmentioning

confidence: 99%

Growing Pereskia aculeata under intermittent irrigation according to levels of matric potential reduction

Queiroz

Andrade

Morais

et al. 2015

Pesqui. Agropecu. Trop.

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Pereskia aculeata Mill., popularly known in Brazil as “Ora-pro-nobis”, is an unconventional edible vegetable. Taking into account its potential for agronomic cultivation, this study aimed to evaluate the growth response of this plant under intermittent drought through controlled reductions in the substrate matric potential, in a greenhouse. Treatments consisted of adding to the pots a volume of water to raise the matric potential to -5 kPa, according to the water retention curve in the substrate, whenever the mean substrate matric potential reached values between -10 kPa and -70 kPa, depending on the treatment. At 140 days after transplanting, leaf area and dry mass of leaves, stems and roots were determined. The intermittent reduction of the matric potential in the root zone of “Ora-pro-nobis” affected less the dry mass accumulation in leaves (reduction of 21.4%) than in stems (reduction of 48.1%) and roots (reduction of 63.7%), and that is interesting because leaves are the main commercial product of this plant. The treatment also modified the proportionality of dry mass allocation among plant parts and reduced the photosynthetic efficiency of leaves, fact evidenced by the linear increase of the specific leaf area (0.63 cm2 g-1kPa-1) and leaf area ratio (0.39 cm-2 g-1kPa-1), although not affecting directly the leaf area.

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Morpho-anatomical and micromorphometrical evaluations in soybean genotypes during water stress

Abstract: In a greenhouse experiment, morpho-anatomical and micromorphometrical analyses of two soybean cultivars

Cited by 12 publications

References 19 publications

Anatomical adaptations of Astragalus gombiformis Pomel. under drought stress

Anatomical adaptations of Astragalus gombiformis Pomel. under drought stress

Agronomic performances of three vetch species growing under different drought levels

Growing Pereskia aculeata under intermittent irrigation according to levels of matric potential reduction

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