欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志

• 研究报告 • 上一篇    下一篇

镉胁迫对不同基因型水稻生长及矿质营养元素吸收的影响

陈京都1,2,何理1,许轲1,戴其根1**,郭保卫1,张洪程1,霍中洋1,魏海燕1   

  1. (1扬州大学农业部长江流域稻作技术创新中心/江苏省作物遗传生理重点实验室, 江苏扬州 225009; 2扬州市农产品质量监督检测中心, 江苏扬州 225101)
  • 出版日期:2013-12-10 发布日期:2013-12-10

Growth and nutritional element absorption of different rice genotypes under cadmium stress.

CHEN Jing-du, HE Li, XU Ke, DAI Qi-gen**, GUO Bao-wei, ZHANG Hong-cheng, HUO Zhong-yang, WEI Hai-yan   

  1. (1Innovation Center of Rice Cultivation Technology in Yangtze Valley, Ministry of Agriculture/Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Yangzhou University, Yangzhou 225009, Jiangsu, China; 2Yangzhou City of Agricultural Products Quality Supervision and Inspection Center, Yangzhou 225009, Jiangsu, China)
  • Online:2013-12-10 Published:2013-12-10

摘要:

选择5种代表性的不同基因型水稻,研究了Cd胁迫对水稻的生长发育、产量及其构成因素以及Ca、Mg、P和K等矿质营养元素吸收的影响。结果表明:Cd胁迫显著降低了水稻的产量、穗数和结实率,但粒重受影响不显著。Cd胁迫抑制了各生育时期干物质的生产和积累,主要表现在生育前中期,随着生育进程抑制作用逐渐减弱。Cd胁迫对水稻生长发育的影响存在显著基因型差异,汕优63和秀水63受Cd影响程度小,耐Cd性强,为Cd耐性品种,两优培九、甬优8号和扬稻6号受Cd影响程度大,耐Cd性弱,为Cd敏感性品种。Cd胁迫促进了Ca的吸收,抑制了Mg、P和K的吸收,同时也影响了其在地上部各器官的分配和积累,且存在着基因型的差异。与CK相比,Cd耐性品种Ca含量增加幅度较Cd敏感性品种大,而在Mg、P和K中没有出现类似的现象,由此可以推断,水稻耐Cd性可能与Ca元素代谢存在一定的关系。
 

Abstract: A pot experiment was conducted to study the effect of Cd on growth and absorption of Ca, Mg, P, and K of five different rice genotypes (Xiushui 63, Yongyou 8, Yangdao 6, Liangyoupeijiu and Shanyou 63). Cd was added into soil at two levels, i.e. 0 (CK) and 25 mg·kg-1. The result showed that the yield, panicle number and filled spikelet rate reduced significantly under Cd stress, but the reduction of grain weight was not significant. The effect of Cd stress on restraining the production of biomass mainly occurred in the early period, and weakened gradually during the growing process. The Cd effect was different among the different rice genotypes. The growth of Shangyou 63 and Xiushui 63 was less affected by Cd while the growth of Liangyoupeijiu, Yongyou 8 and Yangdao 6 was affected a lot. The effect of Cd stress on the absorption of mineral nutrients in different aboveground organs was also observed. When exposed to Cd stress, the absorption of K, P and Mg was lowered, but the absorption of Ca was increased. In addition, under Cd stress the distribution and accumulation of Ca, Mg, P and K in different aboveground organs was also affected to variable extents in the different rice genotypes. Compared with CK, the increase in Ca concentration in the Cd-tolerant variety was more than that of the Cd-sensitive variety, and such a phenomenon was not observed for Mg, P and K. This indicated that the resistance of rice to Cd may be related to Ca metabolism.