摘要
供试小麦基因型 ,分别为浙麦 1号、ZAU97- 2和扬麦 5号 ;设 0 (N0 ) ,12 0 (N1)和 2 4 0 (N2 )Nkg/hm2 3种氮水平处理。浙麦 1号上部叶片直立 ,在株高 4 0cm处光强最大 ,而植株底部以ZAU97 2的光强最大 ,这与其分蘖较少有关。随着N水平的提高 ,植株各部位的光强明显减弱。籽粒灌浆初期剑叶的光合强度 ,高秆基因型浙麦 1号显著大于其它两个半矮秆基因型 ;随着N水平的提高 ,光合强度增强 ,其中N1,N2 与N0 的差异达显著。剑叶展开后的第 2 3天 ,浙麦 1号和扬麦 5号的叶绿素含量分别为最高和最低 ,但此后前者急剧下降 ,而后者相对保持稳定。扬麦 5号的产量最高 ,分别比浙麦 1号和ZAU97 2高 36 .9%和 10 .6 %。从基因型考虑籽粒灌浆初期剑叶的光合强度和籽粒产量无显著相关 ,而从氮肥处理分析 。
Field experiment was carried out on the experimental farm of Zhejiang University,Hangzhou,during 1998-1999 to study the genotypic and nitrogen variation of photosynthetic rate and light distribution within canopy of winter wheat ( Triticum aestivum L.). The experiment consists of nine combinations of three wheat genotypes, namely Zhemei 1(V 1),ZAU97 2 (V 2) and Yangmei 5 (V 3) and three N levels i.e.O (N 0),120 (N 1) and 240 (N 2) kg N/hm 2.Genotype V 1 had more light interception below 40 cm because of erect leaves in comparison to two other genotypes, but at bottom V 2 had higher light intensity due to less tillers/plant. Significantly highest Pn rate, 22.03 μmol C0 2 m -2 s -1 was recorded in V 1,being a taller cultivar, while two other semi dwarf cultivars, V 2 and V 3 gave lower Pn values. N 2 gave the maximum Pn , 23.54 μmol C0 2 m -2 s -1 , and it differed significantly with N 0, but had no significant difference with N 1. The flag leaves of cultivar V 1 and V 3 contained highest and lowest chlorophyll content,respectively after 23 days of its full development, but later on it decreased sharply in V 1 and slowly in V 3 cultivars. Genotype V 3 gave the highest seed yield that was 36.9% and 10.6% higher than V 1 and V 2 genotypes, respectively.There was no correlation between Pn rate and genotypic grain yield in terms of genotypes, but the correlation(r=0.9) exists as to N treatment.
出处
《浙江农业学报》
CSCD
2000年第4期195-200,共6页
Acta Agriculturae Zhejiangensis
基金
SupportedbytheEducationMinistryofChina
关键词
小麦
光分布
光合作用
基因型
氮肥
产量
Triticum aestivum L.
light distribution
photosynthetic rate
genotypes
nitrogen
