Time to pod set and seed position on the plant were studied as possible within-plant components contributing to variation in quality of seeds within seed lots of soyabean (Glycine max) cultivar IAS-5. Plants were grown at 28/22°C (NT=normal temperatures) or 33/27°C from the beginning of pod set onwards (HT=high after normal temperatures). The heaviest seeds were produced on positions in the canopy where also the earliest pods were formed: main stems versus branches and upper versus lower main stem sections. The variation in weight between seeds within a seed lot was mainly determined by position in the canopy, contributing 23 and 30% under NT- and HT-conditions, respectively. Days to pod set contributed 2 and 27% respectively. Position fully accounted for variation resulting from days to pod set under NT- but not under HT-conditions. Seeds from earlier pods had a lower viability. For explaining differences in viability between seeds within a seed lot, days to pod set of individual seeds was more important than seed position. Components of variation between plants were largely additional to within-plant components and at least of equal importance.
|Journal||Netherlands Journal of Agricultural Science|
|Publication status||Published - 2000|