AGRIS

Data provider:

Icon data provider

R4D is a free access on-line portal containing the latest information about research funded by DFID, including details of current and past research in over 30,000 project and document records. You can search the information on the site in many different ways - browsing by region, country or subject, or searching using key words, and an advanced search based on Boolean logic. There is also a search for research contacts. This means that you can quickly find the information you need on the subjects that interest you.

متوقف (توقف مزود البيانات عن خدمته في أجريس ولم يقدم بيانات وصفية جديدة)
Paper

Written Paper

Restriction of transpiration rate under high vapour pressure deficit and non-limiting water conditions is important for terminal drought tolerance in cowpea  [2013]

Vadez, V.; Ehlers, J.D.; Cisse, N.; Diop, N.N.; et al.

استعراض النص الكامل

  • NOT AVAILABLE
Drought stress is a major constraint on cowpea productivity, since the crop is grown under warm conditions on sandy soils having low water-holding capacity. For enhanced performance of crops facing terminal drought stress, like cowpea, water-saving strategies are crucial. In this work, the growth and transpiration rate (TR) of 40 cowpea genotypes with contrasting response to terminal drought were measured under well-watered conditions across different vapour pressure deficits (VPD) to investigate whether tolerant and sensitive genotypes differ in their control of leaf water loss. A method is presented to indirectly assess TR through canopy temperature (CT) and the index of canopy conductance (Ig). Overall, plants developed larger leaf area under low than under high VPD, and there was a consistent trend of lower plant biomass in tolerant genotypes. Substantial differences were recorded among genotypes in TR response to VPD, with tolerant genotypes having significantly lower TR than sensitive ones, especially at times with the highest VPD. Genotypes differed in TR response to increasing VPD, with some tolerant genotypes exhibiting a clear VPD breakpoint at about 2.25 kPa, above which there was very little increase in TR. In contrast, sensitive genotypes presented a linear increase in TR as VPD increased, and the same pattern was found in some tolerant lines, but with a smaller slope. CT, estimated with thermal imagery, correlated well with TR and Ig and coul
d therefore be used as proxy for TR. These results indicate that control of water loss discriminated between tolerant and sensitive genotypes and may, therefore, be a reliable indicator of terminal drought stress tolerance. The water-saving characteristics of some genotypes are hypothesised to leave more soil water for pod filling, which is crucial for terminal drought adaptation.

معلومات ببليوغرافية

النوع:
Other
في أجريس منذ:
2013
جميع العناوين:
"Restriction of transpiration rate under high vapour pressure deficit and non-limiting water conditions is important for terminal drought tolerance in cowpea"@eng
Loading...

معلومات ببليوغرافية

النوع:
Other
في أجريس منذ:
2013
جميع العناوين:
"Restriction of transpiration rate under high vapour pressure deficit and non-limiting water conditions is important for terminal drought tolerance in cowpea"@eng