四个栽培棉种花铃期功能叶生理生化特性的比较

Comparison on Physio-biochemical Characteristics of Founctional Leaves from Four Cultivated Cotton Varieties in Boll Development Phase

对四个栽培棉种花铃期功能叶生理生化特性进行研究,结果表明:(1)叶绿素总量、类胡萝卜素在生育期呈现上升趋势并有两个峰值,而且后一个峰值高于前一个。四个栽培棉种叶绿素总量在全生育期变化趋势为陆地棉>非洲棉>亚洲棉>海岛棉,与前人的结果不一致,究其原因有待进一步研究。叶绿素a/b含量在随生育进程呈下降的趋势,且后一个峰值高于前一个。表现为陆地棉>海岛棉>亚洲棉>非洲棉,这与前人是一致的。(2)四个栽培棉种光合色素的吸收光谱相同之处是在长波光有一个吸收高峰,不同之处主要是在紫外区。(3)四个栽培棉种花铃期功能叶转化酶、可溶性糖随生育期的推移而呈下降的趋势;蛋白质含量整个生育期变化不大,但不同栽培棉种差异达到极显著。

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 mate rials, 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 proce- dure. 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 gradu ally 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.