不同铃重基因型棉花盛花期^(14)C-同化物在“铃-叶系统”中的分配特征  

Distribution of 14C-assimilates in boll-leaf system at full-blooming stage of three cotton genotypes with different boll weight

作　　者：陈文雪[1] 李存东[1] 孙红春[1] 张海娜[1] 贾蕾[1] 

机构地区：[1]河北农业大学农学院,河北保定071001

出　　处：《植物营养与肥料学报》2007年第4期714-718,共5页Journal of Plant Nutrition and Fertilizers

基　　金：国家自然科学基金(30370833);高等学校博士学科点专项科研基金(20050086003);河北省自然科学基金(303179);教育部重点科技项目(02019)资助

摘　　要：以大铃、中铃和小铃3个不同铃重棉花基因型为材料,通过在盛花期测定棉株中部主茎和果枝叶面积及叶面积指数,并用14CO2饲喂中部主茎叶,研究了14CO2同化物在棉株不同层次"铃-叶系统"中的分配特征。结果表明,盛花期中部主茎和果枝单叶面积与铃重呈正相关。小铃基因型棉花群体盛花期叶面积指数最大;大铃基因型棉花蕾铃比中、小铃基因型表现出更强的库活性。主茎叶片产生的同化物除主要输送到对应的果枝外,还向上部、下部的库器官及主茎生长点输送;而流向其对应果枝的同化物,主要供应第一果节蕾铃。By measuring axial and sympodial leaf areas in the middle position and leaf area index （LAI）, the distribution of ^14CO2-assimilates on different ＂boll-leaf system＂ levels in three boll-weight cotton （ Gossypium hirsutum L. ） genotypes were studied by feeding ^14CO2 on middle axial leaf at full-blooming stage in 2005. These three different boll-weight cotton genotypes were big-boll-weight genotype （Sumian9108, 7.49 g/boll）, middle-boll-weight genotype （Xinmian33B, 4.62 g/boll） and small-boll-weight genotype （Ceheng, 3.98 g/boll）. The results indicated that areas of axial and sympodial leaves in the middle position were positively correlated with boll weight. The LAI of small-boll-weight genotype was the biggest among the three cotton genotypes at full-blooming stage, followed by big-boil-weight genotype and middle-boll-weight genotype. The ^14C- assimilates were mostly distributed in buds and bolls at ＂boll-leaf system＂, only a little was distributed in other leaves. The proportion of ^14C-assimilates in buds and bolls of big-boll-weight cotton genotype were the biggest among these three cotton genotypes, so big-boll-weight cotton genotype had stronger sink activity than other two cotton genotypes. The ^14C-assimilates produced in axial leaf were mostly distributed to corresponding fruit branch. In middle-boil-weight genotype, the ^14C-assimilates were mostly distributed in upper fruit branch. Only a little was distribut- ed to the lower fruit branches and main stem point. The three boll-weight cotton genotypes differed in distribution tendency of ^14C-assimilates in middle axial leaf to corresponding fruit. The ^14C-assimilates made by middle axial leaf at fullblooming stage were mostly distributed to bolls in the first position, and big-boll-weight cotton genotype had the biggest distribution proportion, followed by middle-boll-weight genotype and small-boU-weight genotype. As to ^14C-assimilates distributed to bolls in second position, the distribution proportion in small-boll-weigh

关 键 词：棉花 ^14C-同化物 叶位 铃-叶系统 分配 

分 类 号：S562[农业科学—作物学]