Login | Request Account (DAF staff only)

Does increased leaf appearance rate enhance adaptation to postanthesis drought stress in sorghum?

Share this record

Add to FacebookAdd to LinkedinAdd to XAdd to WechatAdd to Microsoft_teamsAdd to WhatsappAdd to Any

Export this record

View Altmetrics

van Oosterom, E. J., Borrell, A. K., Deifel, K. S. and Hammer, G. L. (2011) Does increased leaf appearance rate enhance adaptation to postanthesis drought stress in sorghum? Crop Science, 51 (6). pp. 2728-2740. ISSN 0011-183X

Full text not currently attached. Access may be available via the Publisher's website or OpenAccess link.

Article Link: https://doi.org/10.2135/cropsci2011.01.0031


Increased leaf appearance rate (LAR) could reduce preanthesis water use of sorghum [Sorghum bicolor (L.) Moench] by restricting plant size via reduced tillering. The aim of this paper was to assess LAR as a potential pathway for adaptation to postanthesis drought stress. Four hybrids with different LAR were grown in four semicontrolled experiments under well-watered conditions or postanthesis drought stress and in two irrigated field experiments. Observations included leaf area dynamics, transpiration, transpiration efficiency (TE), leaf N, biomass, and grain yield. ATx642 hybrids (0.0306 leaf °C d−1) had significantly greater LAR than AQL39 hybrids (0.0279 leaf °C d−1) and this increased early main shoot vigor. Under low plant density, this reduced tiller number and hence leaf area and biomass around anthesis. As hybrids had similar TE and differed little in phenology, this can reduce preanthesis water use. Water availability at flag leaf determined grain number per plant (adjusted R2 = 0.80, p < 0.01) and hence grain yield. However, the effect of increased LAR on reduced plant size was temperature dependent. Under high temperature, genotypic differences in tillering were reduced and main shoot leaf number increased more in hybrids with greater LAR. This increased responsiveness of leaf number could increase plant size and water use at anthesis. Hence, greater LAR may confer drought adaptation only in specific environments unless it is also associated with critical aspects of biomass partitioning.

Item Type:Article
Subjects:Science > Botany > Plant physiology
Agriculture > Agriculture (General) > Agricultural meteorology. Crops and climate
Plant culture > Field crops > Sorghum
Live Archive:11 Apr 2024 01:11
Last Modified:11 Apr 2024 01:11

Repository Staff Only: item control page