Time of pod set and seed position on the plant contribute to variation in quality of seeds within soybean seed lots

摘要

abstract_textpTime 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 soybean (Glycine max (L.) Merrill) cultivar IAS-5. Plants were grown at 28/22 degreesC (NT = normal temperatures) or 33/27 degreesC 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 MT-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 MT-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./p/abstract_text