Adaptation of Species of Centrosema to Water Stress

Ludlow, M. M.; Chu, A. C. P.; Clements, R. J.; Kerslake, R. G.

doi:10.1071/pp9830119

Cited by 59 publications

(28 citation statements)

References 6 publications

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“…As a consequence, leaf water potential would fall more rapidly as a result of OA (Morgan 1984) and cause leaf and plant death when the threshold of lethal relative water content is reached, or if the soil water is exhausted (Ludlow & Muchow 1990). Ludlow & Muchow (1990) further illustrated this case by pointing out that some high OA legume species die before other species that have low OA (Ludlow et al . 1983;Sinclair & Ludlow 1986).…”

Section: Turgor Maintenancementioning

confidence: 99%

Osmolyte accumulation: can it really help increase crop yield under drought conditions?

Serraj

Sinclair

2002

Plant Cell & Environment

736

370

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Osmolyte accumulation (OA) is frequently cited as a key putative mechanism for increasing yields of crops subjected to drought conditions. The hypothesis is that OA results in a number of benefits that sustain cell and tissue activity under water-deficit conditions. It has been proposed as an effective tolerance mechanism for water deficits, which could be enhanced in crops by traditional plant breeding, marker-assisted selection or genetic engineering, to generate drought-tolerant crops. However, field studies examining the association between OA and crop yield have tended to show no consistent benefit. The few, often-cited, investigations with positive associations were obtained under severe water deficits with extremely low yields or conditions with special water-supply scenarios when much of the benefit is plant survival. Under conditions where water deficits threaten crop survival, yields are so low that even large fractional yield gains offer little practical benefit to growers. Indeed, the often-cited benefit of turgor maintenance in cells is likely to result in crop behaviour that is exactly opposite to what is beneficial to crops. The one clear mechanism identified in this review for beneficial yield responses to OA is in the maintenance of root development in order to reach water that may be available deeper in the soil profile.

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Section: Turgor Maintenancementioning

confidence: 99%

Osmolyte accumulation: can it really help increase crop yield under drought conditions?

Serraj

Sinclair

2002

Plant Cell & Environment

736

370

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“…The approach outlined above is the most appropiate to test the adaptive value of a particular mechanism, although it would require substantial time and effort. Meanwhile, species comparisons in agronomie performance under drought (e.g., Lawn, 1982 b) and in water stress tolerance and survival (e.g., Ludlow et al, 1983) provide clear evidence of the large number of adaptive mechanisms to water deficits and the wide range in the degree of their expression. lt is this variability which offers the greatest hope for overcoming the numerous difficulties encountered in breeding crop plants for drought resistance.…”

Section: ~~-----------------------------mentioning

confidence: 99%

“…Probably, the photosynthetic apparatus also adjusts to water stress, maintaining reasonable rates of carbon dioxide assimilation which in turn require a certain degree of stomatal opening. The recent work of Ludlow et al (1983) demonstrating good correlation between stomatal adjustment and the water stress tolerance of severa! legumes, confirms the important role that stomatal response to water stress plays in plant adaptation to water deficits.…”

Section: ~~-----------------------------mentioning

confidence: 99%

Variability in adaptive mechanisms to water deficits in annual and perennial crop plants

Fereres¹

1984

Bulletin de la Société Botanique de France. Actualités Botaniqu

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Summary.-Terrestrial plants have evolved numerous mechanisms which enable them not only to survive, but to achieve substantial productivity levels under drought. Most adaptive mechanisms appear to be directed at either avoiding or tolerating plant water deficits. The sensitivity of leaf area expansion to mild water stress is emphasized, suggesting that it has adaptive significance by acting as a partitioning mechanism which favours root growth and hence improves the shoot water status.Alterations in developmental pathways often aid the plant in avoiding dehydration by adjusting its life cycle to the available water supply. Mechanisms of dehydration tolerance include the control of transpiration and the maintenance of turgor through osmotic adjustment. Examples of adaptive mechanisms and their possible role in yield responses under water stress are presented for sorghum, cotton and sunflower as annuals and orange, almond and olive trees as perennials. There is substantial variability in the degree of expression of several adaptive mechanisms and this has important implications for the improvement of crop production under water stress.Résumé.-Les plantes terrestres ont développé de nombreux mécanismes leur permettant non seulement de survivre, mais encore d'atteindre des rendements substantiels quand elles sont soumises à la sécheresse. La plupart de ces mécanismes tendent à éviter les déficits hydriques ou à les tolérer. La sensibilité de la croissance de la surface foliaire à un déficit hydrique modéré peut être considérée comme un mécanisme adaptatif, intervenant dans le transfert des assimilats qui favoriserait la croissance de la racine, améliorant ainsi l'état hydrique de la plante.Ce sont souvent des modifications des voies de développement qui aident la plante à éviter la déshydratation en ajustant son cycle à la disponibilité de l'eau dans le milieu. Les mécanismes de tolérance à la déshydratation concernent à la fois le contrôle de la transpiration et le maintien de la turgescence grâce à la régulation osmotique. Certains de ces mécanismes et leurs effets possibles sur les rendements des cultures soumises à la sécheresse sont décrits dans les cas du sorgho, du cotonnier et du tournesol pour les plantes annuelles et dans ceux de l'oranger, de l'amandier et de l'olivier pour les plantes vivaces. Une grande variabilité apparaît dans le degré d'expresssion des diffé-rents mécanismes adaptatifs et cela présente des implications importantes pour l'amélioration des rendements des cultures soumises à la sécheresse.

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“…The use of molecular markers (DNA markers) provides a more effective selection technique for crop improvement and has an advantage over selection based on phenotype [5,10]. Amplified fragment length polymorphism (AFLP), and microsatellite or simple sequence repeat (SSR) are PCR-based markers and proved to be very powerful tools for investigating genetic relationships between plant species and genetic mapping.…”

Section: Introductionmentioning

confidence: 99%

“…Drought resistance is a complex trait influenced by four general physiological mechanisms: Escape, avoidance, tolerance, and recovery [4,5,8,13]. In upland rice root thickness, deep rooting, and root/shoot ratio are considered as the most important root traits for drought resistance [21].…”

Section: Introductionmentioning

confidence: 99%

Nguyen Duc Thanh∗, Nguyen Thi Kim Lien, Pham Quang Chung, Tran Quoc Trong, Le Thi Bich Thuy, and Henry Nguyen

Thành

Liên

Chung

et al. 2017

AJSTD

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Upland rice grows on 19 million ha, about 15% of the world's rice plantation [2]. The production of upland rice is crucial to agricultural economy of many countries [15]. The yield of upland rice is very low with an average of about 1 t/ha. Drought is a major constraint to the productivity of upland rice. In this paper, we present the results on mapping QTLs for root traits related to drought resistance (maximum root length, root thickness, root weight to shoot and deep root weight to shoot ratios) in upland rice using a recombinant inbreed (RI) population derived from a cross between Vietnamese upland rice accessions. The first molecular linked of Vietnamese upland rice were constructed. The map consists of 239 markers (36 SSR and 203 AFLP markers) mapped to all 12 rice chromosomes. This map covered 3973.1 cM of rice genome with an average distance of 16.62 cM between the markers. Twenty three putative QTLs were detected. Among them, four QTLs for MRL, four QTLs for R/SR, four QTLs for DR/SR, two QTL for RN, two QTLs for RT, two for PH, and five QTLs for TN were recorded. There are several SSR markers such as RM250, RM270, RM263, RM242, RM221 linked to QTL regions. They could be very useful for drought resistant selection in rice. Some common QTLs for maximum root length and deep root weight to shoot ratio were observed in different genetic background (RDB09 × R2021 and IR64 × Azorean populations) and ecological locations (IRRI and Vietnam). These QTLs could be very useful for precise locating drought resistant gene(s) and marker-assisted selection.

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Adaptation of Species of Centrosema to Water Stress

Cited by 59 publications

References 6 publications

Osmolyte accumulation: can it really help increase crop yield under drought conditions?

Osmolyte accumulation: can it really help increase crop yield under drought conditions?

Variability in adaptive mechanisms to water deficits in annual and perennial crop plants

Nguyen Duc Thanh∗, Nguyen Thi Kim Lien, Pham Quang Chung, Tran Quoc Trong, Le Thi Bich Thuy, and Henry Nguyen

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