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Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
RESEARCH ARTICLE

Quantifying genetic effects of ground cover on soil water evaporation using digital imaging

Daniel J. Mullan A B and Matthew P. Reynolds A
+ Author Affiliations
- Author Affiliations

A CIMMYT, Apartado Postal 6-641, 06600 México, DF, Mexico.

B Corresponding author. Email: dmullan@intergrain.com

Functional Plant Biology 37(8) 703-712 https://doi.org/10.1071/FP09277
Submitted: 16 November 2009  Accepted: 26 March 2010   Published: 26 July 2010

Abstract

Rapid development of leaf area and/or aboveground biomass has the potential to improve water harvest of rain fed wheat in Mediterranean-type environments through reduced soil evaporation. However, quantitative relationships between genetic differences in early ground cover and soil water evaporation have not been established. Furthermore, accurate phenotyping of ground cover and early vigour have typically been achieved via destructive sampling methods, which are too time-consuming to undertake within breeding programs. Digital image analysis has previously been identified as an alternative indirect method of analysis, whereby computer analysis is ued to determine percentage ground cover. This study uses a digital ground cover (DGC) analysis tool for high throughput screening of four large wheat populations. The DGC methodology was validated via comparisons with alternative measures of canopy cover, such as normalised difference vegetation index (NDVI) (r2 = 0.69), biomass (r2 = 0.63), leaf area index (r2 = 0.80) and light penetration through the canopy (r2 = 0.70). The wheat populations were utilised to estimate the potential variation in soil evaporation associated with genetic differences in early ground cover, which was validated using established models. Estimates of genetic differences in soil evaporation within the four populations (6.90–24.8 mm) suggest that there is sufficient genetic variation to increase water harvest through targeting faster ground cover. Implications for improved wheat yields and breeding are discussed.

Additional keywords: digital ground cover, early vigour, leaf area index, normalised difference vegetation index, Triticum aestivum, wheat.


Acknowledgements

The authors thank Mayra Jacqueline Barcelo and Tamara Urbalejo Rodriguez for their dedicated assistance with the collection of phenotypic data during this study. We also extend our appreciation to the Generation Challenge Program and the Grains Research and Development Corporation for their financial assistance.


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