Flooding Tolerance of Sugarcane in Relation to Growth, Physiology and Root Structure

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Different abiotic stresses, such as typhoon, excess water from the torrential rains, flooding during summer in the low lying areas and drought hinder sugarcane productivity. This study was initiated to analyze flooding induced changes in growth, physiology and root structure of sugarcane. A Japanese sugarcane variety, NiF8, was grown in pots inside a glasshouse under natural light and flooded for one month. Flooding increased root, leaf, stalk and total dry weight. Three different kinds of roots were initiated from the flooded plants, viz. (i) from the aerial nodes (above the water surface), which were reddish-black in color; (ii) from the pre-existing roots primordia, which were developed under water and whitish in color; and (iii) from the newly developed roots, which had upward growth against the gravity and major portion above the water surface, were relatively thinner and pinkish in color. Roots growth showed a positive relationship with that of shoot growth. Photosynthetic rate (Pn) was decreased by flooding, but stomatal conductance (gs) and intercellular CO2 concentrations (Ci) were increased; thus, indicated a non-stomatal limitation to Pn. Sugar concentration (brix) was found higher in the flood affected plants, especially in the juice of base and middle part of the stalk.
鹿児島大学,カゴシマダイガク,Kagoshima Universityuの論文