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Stay-green in spring wheat can be determined by spectral reflectance measurements (normalized difference vegetation index) independently from phenology

Autor: Lopes, M.S.
Autor: Reynolds, M.P.
Año: 2012
ISSN: 0022-0957
URI: http://hdl.handle.net/10883/2903
Resumen: The green area displayed by a crop is a good indicator of its photosynthetic capacity, while chlorophyll retention or ?stay-green? is regarded as a key indicator of stress adaptation. Remote-sensing methods were tested to estimate these parameters in diverse wheat genotypes under different growing conditions. Two wheat populations (a diverse set of 294 advanced lines and a recombinant inbred line population of 169 sister lines derived from the cross between Seri and Babax) were grown in Mexico under three environments: drought, heat, and heat combined with drought. In the two populations studied here, a moderate heritable expression of stay-green was found?when the normalized difference vegetation index (NDVI) at physiological maturity was estimated using the regression of NDVI over time from the mid-stages of grain-filling to physiological maturity?and for the rate of senescence during the same period. Under heat and heat combined with drought environments, stay-green calculated as NDVI at physiological maturity and the rate of senescence, showed positive and negative correlations with yield, respectively. Moreover, stay-green calculated as an estimation of NDVI at physiological maturity and the rate of senescence regressed on degree days give an independent measurement of stay-green without the confounding effect of phenology. On average, in both populations under heat and heat combined with drought environments CTgf and stay-green variables accounted for around 30% of yield variability in multiple regression analysis. It is concluded that stay-green traits may provide cumulative effects, together with other traits, to improve adaptation under stress further.
Lenguaje: English
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Tipo: Article
Región: Global
Paginas: 10-14 pags
No de Revista: 10
Revista: Journal of Experimental Botany
Volumen de la Revista: 63
DOI: 10.1093/jxb/ers071
Palabras Claves: Chlorophyll loss
Palabras Claves: NDVI
Palabras Claves: Maturity
Palabras Claves: SPAD
Palabras Claves: Triticum aestivum


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