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Annals of Botany 85: 335-343, 2000
© 2000 Annals of Botany Company

Effects of Photoperiod and Maturity Genes on Plant Growth, Partitioning, Radiation Use Efficiency, and Yield in Soyabean [Glycine max(L.) Merrill] ‘Clark’

R. H. Ellis+, H. Asumadu, A. Qi and R. J. Summerfield

Plant Environment Laboratory, Department of Agriculture, The University of Reading, Cutbush Lane, Shinfield, Reading, RG2 9AD, UK

Received: 27 August 1999 ; Returned for revision: 22 September 1999 . Accepted: 8 November 1999

Plants of four isolines of soyabean [Glycine max(L.) Merrill] ‘Clark’, viz‘L71-920’ (maturity gene complemente1e2e3 ), ‘L80-5914’ (E1e2e3), ‘Clark’ (e1E2E3), and ‘L65-3366’ (E1E2E3), were grown in short (12.25 h d - 1natural light) and long days (12.25 h d - 1natural light supplemented with 2.75 h d - 1low-irradiance artificial light) from first flowering to maturity in a polythene tunnel maintained at 30/24°C (day/night). Whereas there were few differences among the isolines grown in short days, in long days the dominant alleles increased crop duration, biomass and seed yield substantially. Increases in biological and economic yield were not solely a consequence of longer crop duration: the dominant alleles also increased crop growth rate and radiation use efficiency in long days (from 1.3 g MJ - 1total radiation ine1e2e3 to 2.8 g MJ - 1inE1E2E3 ). Greater radiation use efficiency resulted from a relatively longer leaf area duration, better distribution and orientation of a larger mass of leaves within the canopy, and smaller partitioning of assimilates to reproductive structures. The work reveals the substantial effects of the three lociE1 / e1, E2/ e2and E3/e3 on the response of plant growth, as well as development, to environment. Their relevance to crop adaptation is discussed. Copyright 2000 Annals of Botany Company

Glycine max(L.) Merrill, soyabean, maturity genes, flowering, phenology, growth, yield


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