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Seasonal Variation in Starch Accumulation and Starch Granule Size in Cassava Genotypes in a Tropical Savanna Climate

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Department of Agronomy, Faculty of Agriculture, Khon Kaen University, Khon Kaen 40002, Thailand
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Department of Biology, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
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Peanut and Jerusalem Artichoke Improvement for Functional Food Research Group, Department of Agronomy, Faculty of Agriculture, Khon Kaen University, Khon Kaen 40002, Thailand
*
Author to whom correspondence should be addressed.
Agronomy 2018, 8(12), 297; https://doi.org/10.3390/agronomy8120297
Received: 24 October 2018 / Revised: 25 November 2018 / Accepted: 27 November 2018 / Published: 7 December 2018
(This article belongs to the Section Crop Breeding and Genetics)
The information on genotypic responses to the seasonal variation in the starch content, starch yield, and starch quality of cassava is limited. The objective of this research was to investigate the seasonal variation of starch characteristics of three cassava genotypes grown under irrigation. The experiment was conducted at four planting dates (20 April, 30 June, 5 October, and 15 December 2015). Three cassava genotypes (CMR38-125-77, Kasetsart 50, and Rayong 11) were evaluated in a randomized complete block design with four replications and the plants were harvested at 12 months. The planting date contributed the largest portion of the total variation in the starch content, starch yield, and starch granule size. The amylose content variability was heavily influenced by genotype. Cassava planted on 5 October or 15 December had greater starch content, starch yield, and starch granule in most genotypes. This was likely due to a higher temperature and solar radiation during the 3–9 months post-planting. CMR38-125-77 showed a consistently high starch content, starch yield, and high amylose content for most planting dates except for the starch yield on 20 April, of which Rayong 11 was the best. These findings will be useful for choosing suitable cassava genotypes for different growing seasons and for facilitating breeding efforts for high starch-yielding and high-quality cassava starch in the future. View Full-Text
Keywords: Manihot esculenta; stability; cassava breeding; genotype by environment interactions; planting date Manihot esculenta; stability; cassava breeding; genotype by environment interactions; planting date
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Janket, A.; Vorasoot, N.; Toomsan, B.; Kaewpradit, W.; Banterng, P.; Kesmala, T.; Theerakulpisut, P.; Jogloy, S. Seasonal Variation in Starch Accumulation and Starch Granule Size in Cassava Genotypes in a Tropical Savanna Climate. Agronomy 2018, 8, 297.

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