| To study the growth and development,assimilates accumulation dynamic changes,Water Physiology of spatial distribution rules and physio-biochemical characteristics at all developing stages, field experiments were conducted in Alaer, Xinjiang Province in 2009-2010 by using four Island Cotton (Gossypium barbadense L.) varieties. correlation analysis and regression analysis were used to analyze data,The main results are as follows:1. Self-regulation ability of Island Cotton is stronger in plant growth process, higher number of bolls per plant. Spatial Variation characteristics of leaf area as follows:the middle>the upper>the bottom, each variety show is:YX-193 >AC-599>XH-21 >XH-28. Unit leaf area load capacity increasing with the growth trend of advancing. Leaf area index, photosynthetic potential showed a parabolic curve, leaf area ratio, leaf dry weight ratio and relative growth rate with advancing growth period showed a decreasing trend, specific leaf area and net assimilation rate showed a multi-peak curve.2. Island Cotton assimilate accumulation over time showed an"S"type-curve and could be simulated with a Logistic equation to achieve a significant level. Reached the maximum of total assimilation accumulation time showed: AC-599> XH-28> XH-21>YX-193,AC-599 respectively compared with XH-28,XH-21and YX-193 late 4d,17d,and 23d, the duration of the rapid accumulation of YX-193,AC-599,XH-21 and XH-28 respectively is 58d,83d,64d and 74d, and after emergence respectively in the 83d,94d,86d,93d into the exuberant growth period. Assimilation accumulation rate of genital largest point of time t0, YX-193,AC-599,XH-21 and XH-28 after emergence respectively 120d,135d,124d,130d,the duration of the rapid accumulation of assimilation respectively were 43 ~ 44d,63 ~ 64d,48 ~ 49d,54 ~ 55d.3. Island Cotton leaf water potential increased with increasing leaf position, and the normal plants than drought plants. Cotton leaf cells concentration affected by drought than the normal concentration of irrigation increased 2.0% to 4.0% to 1% or 5% significant,very significant level, concentration of leaf cells reduce gradually with leaf position increased,in the morning leaf cell concentration is generally low, reached the maximum at noon 14:00 ~ 16:00, with the temperature drop after 16:00 also gradually reduced. Normal irrigation of cotton in vivo tissue water content,relative water content was significantly higher than the drought-hit cotton, relative water content and critical saturated deficit low, Moisture natural saturated deficit and water-demand degree are big. Daily variation in Tr showed a single peak or a bimodal trend, Cond was positively related with Tr, leaf temperature, atmospheric temperature, Cond was significant or very significant level with Tr correlation, Cond and Tr of spatial variation as follows: during the blooming period to fall down 2 or 3 leaves (topping ago) the highest, for this boundary, with the increase leaf position gradually decreased,with leaf position decreased dramatically lower.4. Leaf SPAD values with the growth period increased and then decreased over the trend, boll period reached peak, and later SPAD values begin to decline with the plant aging. SPAD value increased with leaf position increased, the change function of a quadratic polynomial can be described, SPAD values in different periods there were significant difference with the leaf nodes. |
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