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Gao X.X.,Yunnan Institute Pesquisa Sugarcane | Fan X.,Yunnan Institute Pesquisa Sugarcane | Dao J.M.,Yunnan Institute Pesquisa Sugarcane | Deng J.,Yunnan Institute Pesquisa Sugarcane | And 4 more authors.
Bragantia | Year: 2015

The relationship between endogenous ethylene production and natural defoliation rate was examined in sugarcane cultivars with diferent natural defoliation traits. Ethylene production was examined at diferent positions on leaf sheaths and leaf scars at various sugarcane maturation stages using gas chromatography as an external standard method. During the sugarcane maturation process, ethylene production was greatest in the 2nd leaf sheath scar, followed by the 5th and 10th, in that order. It was also greatest during the early maturation stage, followed by the mid-maturation and harvest stages. Ethylene production of the leaf sheaths and leaf scars difered signifcantly among the sugarcane cultivars. Cultivars that defoliate easily produced signifcantly more ethylene than those that do not defoliate easily. The natural defoliation rates was greatest in the harvest stage, followed by mid-maturation and early maturation stage. Correlation analysis indicated that ethylene production was positively correlated with natural defoliation rates, particularly during early- and mid-maturation stages. © 2015, Instituto Agronomico. All rights reserved.

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