ÃÞ »¨ ѧ ±¨    Cotton Science    2009£¬21(3)£º218-223

 

 

Carbon Accumulation and Distribution in Bolls of Island Cotton ( Gossypium barbadense L.) in Southern Xinjiang
LIU Ming1£¬FAN Jun-hua1£¬CAO Juan1£¬WANG Yin-xiang1£¬ZHANG Jian-hua2
(1.Institute of Plant Science and Technology£¬Tarim University£¬Alar£¬Xinjiang 843300£¬China£»2.Dept of Biology£¬Hong Kong Baptist University£¬Hong Kong, China)

Abstract£ºSugar accumulation and distribution were studied in the bolls of island cotton cultivated in arid area of southern Xinjiang. Dynamic changes were monitored in different parts of bolls at different developing stages. Analysis of the carbon accumulation showed an 'S' type-curve and could be simulated with a Logistic equation. The length of time for all the boll parts to reach their maximum accumulation showed an order as: fiber ©ƒ cotton seed ©ƒ boll shell. Variety Xinhai 28 reached the maximum accumulation 5 to 10 days earlier than variety Youxi 193. With the development of boll, the assimilation in boll shell re-distributed its assimilates and the ratio of boll shell to boll became higher. But the ratio of seeds to boll, the economic coefficient, and the ratio of seed cotton to boll shell weight became lower with the maturation of bolls. As for the contribution of boll shell to the weight of seed-cotton, Xinhai 28 showed a larger portion than Youxi 193. The numbers of ovules, seeds and the percentage of seed weight correlated with the blooming time. Bolls of Xinhai 28 were smaller than those of Youxi 193 in terms of ovule and seed numbers per boll. However, its seed fertility was higher than that of Youxi 193. Xinhai 28 has an earlier blooming, a shorter period of boll maturation, a lower ratio of boll to shell, a higher percentage of developed seeds, more contribution to seed-cotton weight in redistributing of its shell assimilates. The boll ratio, the economic coefficient and the ratio of seed cotton to dry weight, are higher in Xinhai 28 than that in Youxi 193. Apparently such features make Xinhai 28 some advantages over Youxi 193 in terms of early flowering, early development of bolls, early boll maturation and high yield.
Key words£ºGossypium barbadense L.£»boll£»carbon accumulation and distribution£»yield
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