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Partitioning of Photoassimilates by Four Potato Clones 1
Author(s) -
Gawronska H.,
Dwelle R. B.,
Pavek J. J.,
Rowe P.
Publication year - 1984
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1984.0011183x002400060007x
Subject(s) - biology , photosynthesis , labelling , growing season , solanum tuberosum , tubercle , solanaceae , industrial crop , horticulture , botany , plant growth , agronomy , gene , biochemistry , genetics , bacteria , bacilli
The partitioning of photoassimilates was compared for four field‐grown potato clones. Russet Burbank was used as a standard for comparison, and the other three clones were selected because they generally produce higher yields and have higher photosynthetic rates than Russet Burbank. In this study we examined whether the patterns of assimilate partitioning change with the stage of plant development and with the time after labelling and also whether these partitioning patterns vary for different clones. The most recently‐expanded leaf on each plant was labelled with 14 CO 2 at three different growth stages: the beginning of tuberization, 3 and 5‐weeks later; and representative plants from each treatment were harvested at three time intervals: 2 h after labelling, 7 days after labelling, and the end of the growing season. The total quantity of 14 C‐1abel exported from the exposed leaf increased beth with age of the plant and with time after labelling. The exported assimilates were partitioned in varying quantities to all plant organs, including trace amounts to the mother tubers (seed pieces). Some of the assimilates produced after tuber set and originally partitioned to other organs may have been remobilized to the tubers near the end of the season. At later growth stages, some clones delivered assimilates to the tubers more rapidly than others. The potential exists for plant breeders to combine late season maintenance of photosynthesis with rapid and/or greater delivery of assimilates to the tubers as an approach for increasing tuber yield.