棉 花 学 报 Cotton Science 2007，19(6)：477-481
Comparison on Physio-biochemical Characteristics of Founctional Leaves from Four Cultivated Cotton Varieties in Boll Development Phase Abstract：In the present research the physiological-biochemical characteristics of functional leaves from four cotton varieties cultivated widely in boll development stage was conducted. Total chlorophyll and carotenoid contents showed an increasing trend in the reproductive phase. Among which，there were two peak contents. Similarly，the latter peak content was higher than the former. In four tested materials，total chlorophyll content displayed a declined trend from Gossypium hirsutum L.，to G. herbaceum，to G. arboreum ，and to G. barbadense，which didn't accord with the findings from previous studies. The ratio of chlorophyll a contents to b exhibited a decreasing tendency with the productive procedure. However，there had two-peak rates，which showed that the latter peak value was higher than the former. The rate of chlorophyll a contents to b contents expressed an increasing trend，which indicated that：Gossypium herbaceum<G. arboreum<G.barbadense<G.hirsutum. The result was consistent with former researches. In absorption spectra of photosynthetic pigment from four cultivated cotton cultivars leaves，there existed an absorbent extreme within long wave. But their ultraviolet spectra displayed significant difference. Meanwhile，we discovered that invertase content and soluble sugar content of functional leaves from four cotton varieties in boll development stage declined gradually along with productive period. Protein content had no marked change in individual cotton accession in the whole life cycle. However，there exhibited significant differences of protein contents from four cotton varieties.
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