Hydraulic and Non-hydraulic Root-sourced Signals in Old and Modern Spring Wheat Cultivars in a Semiarid Area

Xiong, You‐Cai; Li, Feng Min; Xu, Bin; Hodgkinson, Ken C.

doi:10.1007/s00344-005-0056-4

Cited by 35 publications

(44 citation statements)

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“…He found that the early and rapid response to water deficit was critical for plant survival during drought (Ober and Sharp 2003). The result in this study is also supported by our previous work in eight old and modern hexaploid wheat varieties (Xiong et al 2006). Modern hexaploid wheat had a wider threshold range during which the nHRS and HRS were initiated successively than old hexaploid lines.…”

Section: Distinguishing Criteria For Non-hydraulic Root Signalssupporting

confidence: 88%

“…Modern hexaploid wheat had a wider threshold range during which the nHRS and HRS were initiated successively than old hexaploid lines. Importantly, our survey of differentdecade hexaploid wheat varieties suggested that the advances in GY and drought tolerance would be made by targeted selection for a wider threshold range of nHRS (Xiong et al 2006). The diploid relatives, with the narrowest range of nHRS, had the shortest survival duration after the water supply ceased.…”

Section: Distinguishing Criteria For Non-hydraulic Root Signalsmentioning

confidence: 97%

“…In this study, SWCs were determined gravimetrically every 4 h by weighing pots at the start and end of the photoperiod throughout the whole drying period (Xiong et al 2006). The SWCs at each treatment hour were calculated on the basis of following formula:…”

Section: Plant Materials and Growth Conditionsmentioning

confidence: 99%

“…Earlier onset of nHRS significantly affected drought tolerance and yield performance (Xiong et al 2006). Quantitative study on nHRS would provide researchers in anti-drought physiology with gaining insight into the functional basis of abiotic stress signalling.…”

Section: Introductionmentioning

confidence: 99%

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Performance of wheat crops with different chromosome ploidy: root-sourced signals, drought tolerance, and yield performance

Xiong

Zhang

2006

Planta

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Pot-culture experiments were carried out to estimate the role of non-hydraulic root signals (nHRS) and the relation of these signals to drought tolerance and grain yield formation under drought stress in six wheat varieties. These were two modern hexaploid wheat (Triticum aestivum L., AABBDD) Plateau602 and Longchun8139-2, two diploid wheat (Triticum monococcum L., AB) MO1 and MO4, and two tetraploid wheat (Triticum dicoccum Schuebl L., AABB) DM22 and DM31. In the two diploid relatives, the nHRS was switched on and off at a soil water content (SWC) of approximately 53-45% field water capacity (FWC). In contrast, in the modern hexaploid varieties, Longchun8139-2 and Plateau602 the nHRS occurred between a SWC of about 71 and 35% FWC, a much wider soil moisture range. The two tetraploid relatives, DM22 and DM31, were generally intermediate. The nHRS threshold range in SWC also narrowed as all six varieties went through successive developmental stages from shooting to grain filling. The two hexaploid wheat varieties had the longest duration of survival after the water supply ceased, and the best yield stability under drought stress, similar to with tetraploid wheat varieties; the diploid wheat varieties were least robust. These two parameters were both significantly correlated with the nHRS soil moisture threshold range (r=0.9456** and 0.8608*, respectively). Based on these patterns, we propose a "triple Z" model to describe the features of non-hydraulic stomatal sensitivity versus soil drought in wheat growth.

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Section: Distinguishing Criteria For Non-hydraulic Root Signalssupporting

confidence: 88%

Section: Distinguishing Criteria For Non-hydraulic Root Signalsmentioning

confidence: 97%

Section: Plant Materials and Growth Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance of wheat crops with different chromosome ploidy: root-sourced signals, drought tolerance, and yield performance

Xiong

Zhang

2006

Planta

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“…The presence of nHRS and HRS is analyzed by the g s and ψ L responses of well-watered and water-stressed plants (Croker et al 1998, Li et al 2000, Mencuccini et al 2000. Li et al (2000), Xiong et al (2006) and Xu et al (2006a) suggest the use of nHRS and HRS responses to decreasing soil water content (SWC) to evaluate plant-species drought tolerance. Alfalfa (Medicago sativa L.) and milkvetch (Astragalus adsurgens Pall.)…”

Section: Introductionmentioning

confidence: 99%

Biomass partition, leaf gas exchange and water relations of alfalfa and milkvetch seedlings in response to soil drying

Xu¹,

Deng²,

Zhang³

et al. 2010

Photosynt.

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This study compared physiological and growth responses to water stress of two legume species during the seedling stage. Potted alfalfa (Medicago sativa L. cv. Algonquin) and milkvetch (Astragalus adsurgens Pall. cv. Pengyang earlymaturing vetch) seedlings were grown under well-watered [soil water content (SWC) maintained at 14.92% daily] or water-stressed conditions (drying) for 15 days. Net photosynthetic rate (P N ), transpiration rate (E) and stomatal conductance (g s ) of both species decreased parabolically. When SWC decreased to 7.2% and 10.3%, g s values for alfalfa and milkvetch were significantly different from those of the respective well-watered plants (p<0.05). When SWC decreased to 6.6% for alfalfa and 6.8% for milkvetch, leaf water potentials (ψ L ) were significantly different from those of the well-watered plants (p<0.05). Thus the difference between the SWC thresholds for a nonhydraulic root signal (nHRS) and a hydraulic root signal (HRS) were 0.6% and 3.5% for alfalfa and milkvetch, respectively. Milkvetch had a lower g s than alfalfa for a given SWC (p<0.05). Although alfalfa seedlings had a higher dry mass (DM) and root:shoot ratio (R/S) than milkvetch in both treatments (p<0.05), we concluded that milkvetch seedlings had greater drought tolerance than alfalfa.Additional key words: hydraulic root signal; root:shoot ratio; nonhydraulic root signal; water stress.

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Role of abscisic acid in modulating drought acclimation, agronomic characteristics and β‐N‐oxalyl‐L‐α,β‐diaminopropionic acid (β‐ODAP) accumulation in grass pea (Lathyrus sativusL.)

et al. 2021

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BACKGROUND: ⊎-N-oxalyl-L-⊍,⊎-diaminopropionic acid (⊎-ODAP) is a physiological indicator in response to drying soil. However, how abscisic acid (ABA) modulates ⊎-ODAP accumulation and its related agronomic characteristics in drought stressed grass pea (Lathyrus sativus L.) continue to be unclear. The present study aimed to evaluate the effects of ABA addition on drought tolerance, agronomic characteristics and ⊎-ODAP content in grass pea under drought stress.RESULTS: Exogenous ABA significantly promoted ABA levels by 19.3% and 18.3% under moderate and severe drought stress, respectively, compared to CK (without ABA, used as control check treatment). ABA addition activated earlier trigger of nonhydraulic root-sourced signal at 69.1% field capacity (FC) (65.5% FC in CK) and accordingly prolonged its operation period to 45.6% FC (49.0% FC in CK). This phenomenon was mechanically associated with the physiological mediation of ABA, where its addition significantly promoted the activities of leaf superoxide dismutase, catalase and peroxidase enzymes and the biosynthesis of leaf proline, simultaneously lowering the accumulation of malondialdehyde and hydrogen peroxide under moderate and severe stresses. Interestingly, ABA application significantly increased seed ⊎-ODAP content by 21.7% and 21.3% under moderate and severe drought stress, but did not change leaf ⊎-ODAP content. Furthermore, ABA application produced similar shoot biomass and grain yield as control groups.CONCLUSION: Exogenous ABA improved the drought adaptability of grass pea and promoted the synthesis of ⊎-ODAP in seeds but not in leaves. Our findings provide novel insights into the agronomic role of ABA in relation to ⊎-ODAP enrichment in grass pea subjected to drought stress.

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Hydraulic and Non-hydraulic Root-sourced Signals in Old and Modern Spring Wheat Cultivars in a Semiarid Area

Cited by 35 publications

References 44 publications

Performance of wheat crops with different chromosome ploidy: root-sourced signals, drought tolerance, and yield performance

Performance of wheat crops with different chromosome ploidy: root-sourced signals, drought tolerance, and yield performance

Biomass partition, leaf gas exchange and water relations of alfalfa and milkvetch seedlings in response to soil drying

Role of abscisic acid in modulating drought acclimation, agronomic characteristics and β‐N‐oxalyl‐L‐α,β‐diaminopropionic acid (β‐ODAP) accumulation in grass pea (Lathyrus sativusL.)

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