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ARS Home » Southeast Area » Tifton, Georgia » Crop Genetics and Breeding Research » Research » Publications at this Location » Publication #379288
Research Project: Development of High-Yielding, High-Oleic Peanut Cultivars or Germplasm with Tolerance to Biotic and Abiotic Stresses

Location: Crop Genetics and Breeding Research

Title: Seasonal variation in canopy size, light penetration and photosynthesis of three cassava genotypes with different canopy architectures

Author
item MAHAKOSEE, S - Khon Kaen University
item JOGLOY, S - Khon Kaen University
item VORASOOT, N - Khon Kaen University
item THEERAKULPISUT, P - Khon Kaen University
item Holbrook, Carl - Corley
item KVIEN, C - University Of Georgia
item BANTERNG, P - Khon Kaen University

Submitted to: Agronomy
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 10/9/2020
Publication Date: 10/13/2020
Citation: Mahakosee, S., Jogloy, S., Vorasoot, N., Theerakulpisut, P., Holbrook Jr, C.C., Kvien, C.K., Banterng, P. 2020. Seasonal variation in canopy size, light penetration and photosynthesis of three cassava genotypes with different canopy architectures. Agronomy. 10, 1554. https://doi.org/10.3390/agronomy10101554.
DOI: https://doi.org/10.3390/agronomy10101554

Interpretive Summary: Cassava is an important root crop in Thailand. The objectives of this study were to investigate the effect of canopy size (CS) on light penetration and photosynthesis of 3 cassava genotypes with different canopy architectures. The variation in CS depended on temperature, solar radiation (SR), relative humidity (RH) and day length (DL). In early growth stages, the crops planted in May had higher CS that the crops planted in November, because they were subjected to higher temperature, more SR, higher RH and longer DL. In contrast, the storage root accumulation of the crops planted in November was under better climatic factors than the crops planted in May. Therefore, the crops planted in November had higher biomass and storage root yield than the crops planted in May. Genotypes that maintained high CS at the storage root accumulation stage could be indirectly selected for high biomass and storage root yield in cassava breeding programs.

Technical Abstract: The objective of this study was to investigate the effect of canopy size (CS) on light penetration and leaf photosynthesis of 3 cassava genotypes (Kasetsart 50 (KU50), Rayong 11 and CMR38-125-77) under 2 planting dates in 2 years. Data were recorded for CS, leaf area index (LAI), leaf photosynthesis, biomass (BM), storage root yield (SRY), starch content (SC) and harvest index (HI). The variation in CS depended on temperature, solar radiation (SR), relative humidity (RH) and day length (DL). In early growth stages, the crops planted in May had higher CS that the crops planted in November, because they were subjected to higher temperature, more SR, higher RH and longer DL. In contrast, the storage root accumulation of the crops planted in November was under better climatic factors than the crops planted in May. Therefore, the crops planted in November had higher BM and SRY than the crops planted in May for KU50 and CMR38-125-77. However, Rayong 11 in the May planting date maintained higher CS during storage root accumulation that the other genotypes, and BM and SRY of Rayong 11 were not different for 2 planting dates and 2 years. KU50 and CMR38-125-77 had higher BM and SRY in November planting whereas in May planting SRY and BM of the 3 genotypes were not significantly different. Genotypes that maintained high CS at the storage root accumulation stage could be indirectly selected for high BM and SRY in cassava breeding programs.