Phenotyping novel stay-green traits to capture genetic variation in senescence dynamics

Christopher, John T., Veyradier, Mathieu, Borrell, Andrew K., Harvey, Greg, Fletcher, Susan and Chenu, Karine (2014). Phenotyping novel stay-green traits to capture genetic variation in senescence dynamics. In: Interdrought IV. Interdrought IV Conference, Perth, WA Australia, (1035-1048). 2–6 September 2013. doi:10.1071/FP14052

Author Christopher, John T.
Veyradier, Mathieu
Borrell, Andrew K.
Harvey, Greg
Fletcher, Susan
Chenu, Karine
Title of paper Phenotyping novel stay-green traits to capture genetic variation in senescence dynamics
Conference name Interdrought IV Conference
Conference location Perth, WA Australia
Conference dates 2–6 September 2013
Proceedings title Interdrought IV   Check publisher's open access policy
Journal name Functional Plant Biology   Check publisher's open access policy
Place of Publication Clayton, VIC Australia
Publisher C S I R O Publishing
Publication Year 2014
Year available 2014
Sub-type Fully published paper
DOI 10.1071/FP14052
Open Access Status
ISSN 1445-4408
Volume 41
Issue 10-11
Start page 1035
End page 1048
Total pages 14
Collection year 2015
Language eng
Formatted Abstract/Summary
Stay-green plants retain green leaves longer after anthesis and can have improved yield, particularly under water limitation. As senescence is a dynamic process, genotypes with different senescence patterns may exhibit similar final normalised difference vegetative index (NDVI). By monitoring NDVI from as early as awn emergence to maturity, we demonstrate that analysing senescence dynamics improves insight into genotypic stay-green variation. A senescence evaluation tool was developed to fit a logistic function to NDVI data and used to analyse data from three environments for a wheat (Triticum aestivum L.) population whose lines contrast for stay-green. Key stay-green traits were estimated including, maximum NDVI, senescence rate and a trait integrating NDVI variation after anthesis, as well as the timing from anthesis to onset, midpoint and conclusion of senescence. The integrative trait and the timing to onset and mid-senescence exhibited high positive correlations with yield and a high heritability in the three studied environments. Senescence rate was correlated with yield in some environments, whereas maximum NDVI was associated with yield in a drought-stressed environment. Where resources preclude frequent measurements, we found that NDVI measurements may be restricted to the period of rapid senescence, but caution is required when dealing with lines of different phenology. In contrast, regular monitoring during the whole period after flowering allows the estimation of senescence dynamics traits that may be reliably compared across genotypes and environments. We anticipate that selection for stay-green traits will enhance genetic progress towards high-yielding, stay-green germplasm.
Keyword Drought
Leaf Senescence
Triticum aestivum
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

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