Author:
WURR D. C. E.,FELLOWS J. R.,AKEHURST J. M.,HAMBIDGE A. J.,LYNN J. R.
Abstract
Seed crops of the variety Estima were grown in each of 2 years using two planting dates, two harvest
dates, two plant densities and two irrigation regimes to produce seed tubers which had experienced
different cultural and environmental conditions. The effects of these treatments on tuber
characteristics, sprout production and stem development in the ware crop were then determined in
subsequent experiments using storage regimes of 3 and 10 °C. Time of planting the seed crop affected
numbers of eyes, sprouts and above ground stems in the subsequent ware crop because environmental
conditions around the time of tuber initiation appeared to alter tuber shape. Cooler, wetter conditions
in the 7 days after tuber initiation were associated with tubers which were longer, heavier and had
more eyes, sprouts and above ground stems. In contrast, the time of harvesting the seed crop did not
affect tuber shape or numbers of above ground stems and there was no interaction with tuber size.
The density of the seed crop had no effect on any character measured and irrigation well after tuber
initiation did not affect tuber shape, numbers of sprouts or numbers of stems. Seed production
treatments, which resulted in earlier dormancy break, were associated with tubers that produced
more sprouts and above ground stems, in contrast to the conventional understanding of apical
dominance. Storage at 3 °C gave fewer sprouts, a lower proportion of eyes with sprouts and fewer
stems than storage at 10 °C. The major effects on stem production appear to result from
environmental conditions at the time of tuber initiation of the seed crop and sprouting temperature.
Publisher
Cambridge University Press (CUP)
Subject
Genetics,Agronomy and Crop Science,Animal Science and Zoology
Cited by
11 articles.
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