Effects of soil drought and atmospheric humidity on yield, gas exchange, and stable carbon isotope composition of barley

Title:

Effects of soil drought and atmospheric humidity on yield, gas exchange, and stable carbon isotope composition of barley

Creator:

Sánchez-Díaz, M., García, J. L., Antolín, M. C., and Araus, J. L.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:1fbcc8f5-0b01-40a7-a74c-fdf48c9d1685
uuid:1fbcc8f5-0b01-40a7-a74c-fdf48c9d1685
issn:0300-3604
doi:10.1023/A:1022683210334

Subject:

CO2 balance, Hordeum vulgare, transpiration efficiency, water stress, and water use efficiency

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

The combined effects of water status, vapour pressure deficit (VPD), and elevated temperature from heading to maturity were studied in barley. Plants growing at high VPD, either under well-watered or water deficit conditions, had higher grain yield and grain filling rate than plants growing at low VPD. By contrast, water stress decreased grain yield and individual grain dry matter at any VPD. Water regime and to a lesser extent VPD affected δ13C of plant parts sampled at mid-grain filling and maturity. The differences between treatments were maximal in mature grains, where high VPD increased δ13C for both water regimes. However, the total amount of water used by the plant during grain filling did not change as response to a higher VPD whereas transpiration efficiency (TE) decreased. The net photosynthetic rate (PN) of the flag leaves decreased significantly under water stress at both VPD regimes. However, PN of the ears was higher at high VPD than at low VPD, and did not decrease as response to water stress. The higher correlation of grain yield with PN of the ear compared with that of the flag leaf support the role of ear as the main photosynthetic organ during grain filling under water deficit and high VPD. The deleterious effects of combined moderately high temperature and drought on yield were attenuated at high VPD. and M. Sánchez-Díaz ... [et al.].

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

415-421

Source:

Photosynthetica | 2002 Volume:40 | Number:3

Harvested from:

CDK

Metadata only:

false