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作 者 ：陈文雪;李存东;孙红春;张海娜;贾蕾

期 刊 ：植物营养与肥料学报 2007年 13卷 4期 页码：714-718

关键词：棉花；14C-同化物；叶位；铃-叶系统；分配；

Keywords:cotton, 14C-assimilates, leafposition, boll-leafsystem, distribution,

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。

Abstract:By measuring axial and sympodial leaf areas in the middle position and leaf area index(LAI),the distribution of ¹⁴CO₂assimilates 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-boll-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-boll-weight genotype,the ¹⁴C-assimilates were mostly distributed in upper fruit branch.Only a little was distributed to the lower fruit branches and main stem point.The three bollweight 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 full-blooming 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-boll-weight genotype.As to ¹⁴C-assimilates distributed to bolls in second position,the distribution proportion in small-boll-weight genotype cotton was the biggest,followed by middle-boll-weight genotype.

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