摘要
在田间条件下测定了两种氮素水平下直、弯穗型水稻品种的群体光合特性 ,结果表明 :参试的两个水稻品种群体光合速率(CAP)的生育期变化为单峰曲线 ,在籽粒灌浆期 ,直立穗型品种CAP下降幅度慢于弯曲穗型品种 ;增施氮肥可提高CAP,并延长其高值持续期 ;直立穗型品种不同叶位单叶净光合速率(PN)最大值差异不明显 ,增施氮肥可延缓PN高值持续期 ,但对提高PN影响不大。于水稻开花期及乳熟期田间高氮区群体饲喂14CO2,测定结果表明 :直立穗型品种冠层中顶部三片叶的光合速率最高 ,其光合量占单株总光合量的87.4%;弯曲穗型品种测定结果与直立穗型品种相似。直立穗型品种抽穗后剑叶叶绿素含量、光合速率、比叶重、单株根伤流量和冠层生态条件大都优于弯曲穗型品种 ,这可能是直立穗型品种抽穗后CAP下降较缓慢的主要原因。
Canopy apparent photosynthetic(CAP) characteristics of erect-panicle and curved-panicle rice varieties were studied under field conditions with two different levels of soil N-fertility. The results indicated that the change of CAP rate during the whole growing stages of two rice varieties involved was a single peak curve. During the period of grain-filling, the CAP of erect-panicle type variety decreased slower than that of curved one; Application of N-fertilizer could increase CAP and elongate its high value duration. The highest net photosynthetic rate (PN) of different single leaves differs no significantly with erect-panicle type variety. Adding N-fertilizer could elongate higher value phase, but no significant effect on increasing PN. At anthesis and milky stages under field high-nitrogen condition, the results of labeling 14C showed that the three upper leaves of erect-panicle type variety had showed the higher photosynthetic rate, which accounted for 87.4% of the total photosynthate. The similar results were also obtained in curved-panicle variety. During the period of grain-filling, chlorophyll content, PN, specific leaf weight of flag leaf, quantity of root flowing and canopy ecological condition in erect panicle type were basically better than that of curved one, which might be the main reason of the slow decrease of CAP in erect-panicle type variety after anthesis.
出处
《沈阳农业大学学报》
CAS
CSCD
2001年第1期8-12,共5页
Journal of Shenyang Agricultural University
基金
国家自然科学基金(39870523)
教育部RFDP项目
