Stomatal behaviour under terminal drought affects post-anthesis water use in wheat

Saradadevi, Renu; Bramley, Helen; Palta, Jairo A.; Siddique, Kadambot H. M.

doi:10.1071/fp16078

Cited by 17 publications

(15 citation statements)

References 47 publications

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“…Hence, our results showed that branches of most trees studied could effectively continue to get a continuous water supply by using the cracking method for detachment from the tree prior to gas exchange and photosynthesis measurements. Stomatal conductance (g s ) is another indicator of water, energy and CO 2 cycles between plants and the atmosphere (Roche, 2015; Saradadevi et al., 2016). Plants can vary the size of stomata to adapt to the environment.…”

Section: Discussionmentioning

confidence: 99%

Another choice for measuring tree photosynthesisin vitro

Chang-jun

Liu

Chai

et al. 2019

PeerJ

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BackgroundIn the case of tall trees in the field or in rugged terrain where an instrument cannot be placed operationally, beveling is a popular method used to measure in vitro photosynthesis. However, some studies and our own research have shown that net photosynthesis values measured in vitro are generally significantly lower than values measured in situ.MethodsTo develop a more accurate and applicable method for in vitro determination of photosynthesis, we evaluated five different methods for preparing detached tree branches to measure photosynthesis and gas exchange in vitro (beveling, cracking, splitting, girdling, and immersion in salicylic acid solution). Ten common tree-species were used.ResultsBy comparing light response curves and water-status data, we found that (1) it is possible, to some extent, to substitute in vitro measurement of photosynthetic characteristics of tree species for in situ measurement, provided a suitable treatment is employed; (2) the beveling method is likely to underestimate photosynthetic potential of some trees; (3) after cracking application, most detached branches effectively continued to absorb water; and (4) measurements obtained using detached tree-branches processed by the cracking method were closer to those obtained in situ in intact trees; (5) some tree species (Diospyros kaki, Eriobotrya japonica) appeared to be particularly sensitive to the cracking method, and their in-vitro maximum net photosynthesis rate (Pmax) was significantly less than the in-situ value (P < 0.05).DiscussionOur findings provide a methodological support for comprehensive and accurate measurement of plant functional traits. The use of the cracking method contributes to feasibility and reliability of the measurement of photosynthetic parameters in tall trees, thus providing more accurate photosynthetic parameters for the analysis of trade-off strategies at the leaf level.

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Section: Discussionmentioning

confidence: 99%

Another choice for measuring tree photosynthesisin vitro

Chang-jun

Liu

Chai

et al. 2019

PeerJ

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“…The pots (0.15 m diameter and 1.0 m deep) contained 26 kg of soil (volume 0.01766 m3). Several studies have reported that the above volume of soil and particularly depth (1 m) did not show root development restrictions in wheat (Aziz et al, 2016;Saradadevi et al, 2017;Figueroa-Bustos et al, 2019;Pooniya et al, 2019). In addition, Turner (2018) suggested that large tall pots better simulate water extraction and root development similar to field conditions than smaller pots.…”

Section: Plant Materials and Growing Conditionsmentioning

confidence: 99%

Wheat Cultivars With Contrasting Root System Size Responded Differently to Terminal Drought

et al. 2020

Self Cite

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In the Mediterranean-type environment of Australia and other parts of the world, end-ofseason or terminal drought is the most significant abiotic stress affecting wheat grain yields. This study examined the response of two wheat cultivars with contrasting root system size to terminal drought and the effect of terminal drought on grain yield and yield components. The cultivars were grown in 1.0 m deep PVC columns filled with soil in a glasshouse under well-watered conditions until the onset of ear emergence (Z51) when well-watered and terminal drought treatments were imposed. Terminal drought reduced stomatal conductance, leaf photosynthesis, and transpiration rates faster in Bahatans-87 (larger root system size) than Tincurrin (smaller root system size). Terminal drought reduced grain yield in both cultivars, more so in Bahatans-87 (80%) with the large root system than Tincurrin (67%) with the small root system, which was mainly due to a reduction in grain number and grain size in Bahatans-87 and grain size in Tincurrin. In the terminal drought treatment, Bahatans-87 had 59% lower water use efficiency than Tincurrin, as Bahatans-87 used 39% more water and reduced grain yield more than Tincurrin. The lesser reduction in grain yield in Tincurrin was associated with slower water extraction by the small root system and slower decline in stomatal conductance, leaf photosynthesis, and transpiration rates, but more importantly to faster phenological development, which enabled grain filling to be completed before the severe effects of water stress.

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“…These traits are aimed at boosting crop yields by increasing harvest index, stem carbohydrate levels, tiller number, plant height, water use and transpiration efficiency, carbon isotope discrimination and root depth (Blum 2005; Collins et al 2008; Salekdeh et al 2009; Fleury et al 2010; Rebetzke et al 2013). Although these traits managed to gradually improve wheat productivity in water-challenged environments (Richards et al 2014), they did not contribute significantly to drought tolerance per se (Condon et al 2004; Blum 2005; Saradadevi et al 2017a, b). There are very few drought-induced tolerance traits in wheat.…”

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confidence: 99%

Determining the Genetic Architecture of Reproductive Stage Drought Tolerance in Wheat Using a Correlated Trait and Correlated Marker Effect Model

Dolferus

Thavamanikumar

Sangma

et al. 2019

G3 Genes|Genomes|Genetics

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Water stress during reproductive growth is a major yield constraint for wheat ( Triticum aestivum L). We previously established a controlled environment drought tolerance phenotyping method targeting the young microspore stage of pollen development. This method eliminates stress avoidance based on flowering time. We substituted soil drought treatments by a reproducible osmotic stress treatment using hydroponics and NaCl as osmolyte. Salt exclusion in hexaploid wheat avoids salt toxicity, causing osmotic stress. A Cranbrook x Halberd doubled haploid (DH) population was phenotyped by scoring spike grain numbers of unstressed (SGNCon) and osmotically stressed (SGNTrt) plants. Grain number data were analyzed using a linear mixed model (LMM) that included genetic correlations between the SGNCon and SGNTrt traits. Viewing this as a genetic regression of SGNTrt on SGNCon allowed derivation of a stress tolerance trait (SGNTol). Importantly, and by definition of the trait, the genetic effects for SGNTol are statistically independent of those for SGNCon. Thus they represent non-pleiotropic effects associated with the stress treatment that are independent of the control treatment. QTL mapping was conducted using a whole genome approach in which the LMM included all traits and all markers simultaneously. The marker effects within chromosomes were assumed to follow a spatial correlation model. This resulted in smooth marker profiles that could be used to identify positions of putative QTL. The most influential QTL were located on chromosome 5A for SGNTol (126cM; contributed by Halberd), 5A for SGNCon (141cM; Cranbrook) and 2A for SGNTrt (116cM; Cranbrook). Sensitive and tolerant population tail lines all showed matching soil drought tolerance phenotypes, confirming that osmotic stress is a valid surrogate screening method.

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Stomatal behaviour under terminal drought affects post-anthesis water use in wheat

Cited by 17 publications

References 47 publications

Another choice for measuring tree photosynthesisin vitro

Another choice for measuring tree photosynthesisin vitro

Wheat Cultivars With Contrasting Root System Size Responded Differently to Terminal Drought

Determining the Genetic Architecture of Reproductive Stage Drought Tolerance in Wheat Using a Correlated Trait and Correlated Marker Effect Model

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