水分胁迫对棉花不同部位主茎叶^(14C)同化、分配的影响  

Effects of Water Stress on Assimilation and Partitioning of ^(14)C of Different Leaves on the Main Stem of Cotton

作　　者：孙红春[1] 任新茂[1] 李存东[1] 刘连涛[1] 张永江[1] 

机构地区：[1]河北省作物生长调控实验室/河北农业大学,保定071001

出　　处：《棉花学报》2011年第3期247-252,共6页Cotton Science

基　　金：国家自然科学基金项目(30370833);河北省重点基础研究项目(10960206D);河北省自然科学基金项目(C2006000436);河北省高等学校科学技术研究指导项目(22010147)

摘　　要：以新棉33B为试验材料,在防雨棚中设置严重干旱、中度干旱和正常供水3个处理(土壤水分分别为田间持水量的35%～45%、45%～65%、65%～85%),利用14CO2同位素示踪技术研究了水分胁迫对棉花不同层次主茎叶光合同化物运转分配的影响。结果表明:干旱胁迫使叶片光合产物合成受阻,降低了叶片14C的同化量。并且随着干旱程度增强,源叶中光合产物输出率也相应提高。不同生育时期干旱胁迫对源叶光合产物的分配影响不同。严重干旱在蕾期促进光合产物分配到根部和主茎生长点,花铃期及吐絮期促进光合产物分配到邻近的棉铃;中度干旱在蕾期促进光合产物向根部和主茎生长点分配,而盛花期则促进光合产物向下部器官的分配,吐絮期大部分光合产物分配到了邻近棉铃。An experiment was conducted under the shelter at Teaching Experiment Station of Hebei Agricultural University in 2007,with the help of 14C tracer technique,and used Bt-transgenic cultivar（cv.NuCOTN 33B） as the experimental material,during which three field moisture capacity degrees were set up： Severe drought（SD,35%～45% of field moisture capacity）;Middle drought（MD,45%～65% of field moisture capacity）;and normal water supply（CK,65%～85% of field moisture capacity）.The results showed that the characteristics of 14C photosynthetic assimilation and partitioning varied with different water conditions and different parts and growth stages of cotton stem leaves.The synthesis of photosynthetic products of cotton leaves was inhibited under drought stress and 14C assimilation decreased.With the worsening of drought stress,the photosynthetic output of source leaves increased.The partitioning of source leaves photosynthate varied between different growth stages under different levels of water stress.Severe drought promoted the distribution of photosynthate to root and main stalk growing points at budding stage,but to neighboring bolls at flowering and bolling stage as well as boll-opening stage.Middle drought stress promoted the partitioning of photosynthate to root and main stalk growing points at budding and early flowering stages,to the lower organs at full flowering stage and mainly to the neighboring bolls at boll-opening stage.In a word,absorption and assimilation of 14C in leaves were inhibited and leaves photosynthesis were affected under water stress,accordingly the partitioning pattern in every organ of leaf photosynthetic products changed.

关 键 词：棉花 水分胁迫 14C-光合产物 运转分配 

分 类 号：S562[农业科学—作物学]