Evaluation of root distribution patterns and physiological responses of 15 sugarcane genotypes using rhizobox method
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Abstract
Root is an important plant part that takes up nutrients and water for growth, which in association with the physiological traits contributes to the above-ground growth. The development of sugarcane genotypes with root systems and physiological traits were the association with maintaining high yield is necessary. The objective of this study was to evaluate root traits and physiological responses of 15 sugarcane genotypes by rhizobox method under greenhouse condition at the Field Crop Research Station of Khon Kaen University, Khon Kaen, Thailand. The rhizoboxes had the dimension of 50 cm in width, 10 cm in thickness and 120 cm in height. The data were recorded for root length, root dry weight, physiological traits (SPAD chlorophyll meter reading (SCMR), maximum quantum yield of photosystem II, stomatal conductance and relative water content) and shoot dry weight at 60 days after transplanting (DAT). Sugarcane genotypes were significantly different for root characteristics and physiological traits. Sugarcane genotypes were classified into four groups based on total root length, and KK06-419 had the highest root length. Moreover, root length and root surface area were positively correlated with stomatal conductance (r = 0.681, p = 0.01 and r = 0.533; p = 0.05, respectively), whereas chlorophyll fluorescence were negatively correlated with root surface area and root volume (r = -0.621; p = 0.05 and r = -0.618; p = 0.05, respectively). The information obtained in this study will be useful to improve the sugarcane genotypes in breeding program and the sugarcane research in fields others.
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