Earliness in wheat: A key to adaptation under terminal and continual high temperature stress in South Asia

Earliness in wheat: A key to adaptation under terminal and continual high temperature stress in South Asia

•We evaluated 28 newly developed high yielding early maturing CIMMYT wheat lines and 2 checks in South Asia and Mexico.•We identified early maturing lines with higher grain yield and stable performance across locations in South Asia.•Early maturity provides a better adaptation under terminal and con...

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Bibliographic Details
Published in:Field crops research Vol. 151; pp. 19 - 26
Main Authors: Mondal, S., Singh, R.P., Crossa, J., Huerta-Espino, J., Sharma, I., Chatrath, R., Singh, G.P., Sohu, V.S., Mavi, G.S., Sukuru, V.S.P., Kalappanavar, I.K., Mishra, V.K., Hussain, M., Gautam, N.R., Uddin, J., Barma, N.C.D., Hakim, A., Joshi, A.K.
Format: Journal Article
Language:English
Published: Elsevier B.V 01-09-2013
Subjects:
Continual heat stress
Earliness
Heat tolerance
SouthAsia
Terminal heat stress
Triticum aestivum
Wheat
Asia
Mexico
CC
TKW
SouthAsia
DH
DM
CT
GY
Terminal heat stress
Continual heat stress
ME
PH
Heat tolerance
Earliness
Wheat
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Summary:•We evaluated 28 newly developed high yielding early maturing CIMMYT wheat lines and 2 checks in South Asia and Mexico.•We identified early maturing lines with higher grain yield and stable performance across locations in South Asia.•Early maturity provides a better adaptation under terminal and continual high temperature stress common in South Asia.•Canopy temperature and leaf chlorophyll content were identified as promising traits that may contribute to adaptation. High temperatures are a primary concern for wheat production in South Asia. A trial was conducted to evaluate the grain yield performance of high yielding, early maturing heat tolerant CIMMYT wheat lines, developed recently in Mexico for adaptation to high temperature stresses in South Asia. The trial, comprised of 28 entries and two checks, was grown in 13 locations across South Asia and two environments in Mexico. Each location was classified by mega environment (ME); ME1 being the temperate irrigated locations with terminal high temperature stress, and ME5 as warm, tropical, irrigated locations. Grain yield (GY), thousand kernel weight (TKW), days to heading (DH) and plant height (PH) were recorded at each location. Canopy temperature (CT) was also measured at some locations. Significant differences were observed between ME for DH, PH, GY, and TKW. The cooler ME1 locations had a mean DH of 83 days, compared to 68 days mean DH in ME5. The ME1 locations had higher mean GY of 5.26 t/ha and TKW of 41.8g compared to 3.63 t/ha and 37.4g, respectively, for ME5. Early heading entries (<79 days, mean DH) performed better across all locations, with GY of 2–11% above the local checks and 40–44g TKW. Across all locations the top five highest yielding entries had 5–11% higher GY than the local checks. The early maturing CIMMYT check ‘Baj’ also performed well across all locations. In the Mexico location, CT was associated with GY, thereby suggesting that cooler canopies may contribute to higher GY under normal as well as high temperature stress conditions. Our results suggest that the early maturing, high yielding, and heat tolerant wheat lines developed in Mexico can adapt to the diverse heat stressed areas of South Asia.
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content type line 23
ISSN:0378-4290
1872-6852
DOI:10.1016/j.fcr.2013.06.015