This study was carried out during 2006-2012 in a unique area of China that is warm in winter and drought-affected in both winter and spring. We considered how different soil and climatic conditions, various ages of root retention, intercropping of short-season vegetables in winter,
and different pruning times, pruning methods and seedling reserving methods would affect seed production of cotton cv. Dong A (a genetic male-sterile line of upland cotton). We also studied seed production using wild insect pollination under root-retention conditions. The results showed that
the age of root retention should be 2-3 years and not exceed five years in the areas where minimum annual temperature is > 10°C. No crops were interplanted in the winter after harvest nor was pruning carried out; the plants were left to overwinter naturally. The main stem was pruned
1-3 days before the rainy season or irrigation in the next year. The main stem was pruned 100-150 mm above the ground and the regenerated seedlings from the lower part of the main stem were cut close to the stem. During reproduction of the sterile line, when the ratio of fertile to sterile
plants was 1:2 to 1:4, natural insect pollination in the area saved the labour time involved in artificial pollination, which increased the economic benefit by about 10%. Seed production by root retention of genetic male sterile lines can reduce the cost of cotton seed production by 18% compared
with the 2-line method without root retention, and by 60% compared wit h artificial emasculation. Additionally, when this method was applied in mountainous areas where there are many wild insects, it can be supported by insect pollination which further reduces the cost by 16%.
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Document Type: Research Article
August 1, 2015
This article was made available online on May 6, 2015 as a Fast Track article with title: "Research on root retention reproduction technique of genetic male-sterile line in cotton for seed production".
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