耐低钾水稻的幼苗生长及其营养吸收状况

耐低钾水稻品种“湘早糯1号”比需钾品种“黑优-24”和“双桂-36”幼苗根长、根数多,根鲜重较重。缺钾营养液条件下,“湘早糯1号”幼苗(含根)干物重与完全营养液条件的相近,根吸收~(32)P效率较高,比活性强,地上部~(32)P总脉冲数多,根呼吸强度也较强。缺钾条件下植株积累钾量,“湘早糯1号”比其余两个品种增加2～3倍。缺钾比完全营养液条件下,“湘早糯1号”植株地上部积累Na,Mg,Fe,Mn和Zn等明显增多。文中讨论了水稻在缺钾营养条件下可以吸收较多的Na,Mg和Fe等,以作为补偿及调节。

Growth and Nutrient Absorption of Rice Variety Oryza sativa L. Tolerated to Low K~ Condition

Rice variety"Xiang-Zao-Nuo-1" (X-Z-N-1)which is tolerated to low K~ condition has longer roots, more root number and more root fresh weight than the K~ sensi- tive varieties "Hei-You-24" (H-Y-24) and "Shuang-Gui--36" (S-G-36). The plant dry weight (including roots) of "X-Z-N-1" under the condition of K~ deficient solution is about the same which that under complete nutrient solution, but the absor- bing efficiency of ~(32)P,~(32)P cpm/50mg and ~(32)P total cpm of above ground plant are higher than those under complete solution condition.Inversely those of the"H-Y-24" and "S-G-36" than those are low. The photosynthetic rate of "X-Z-N-1" is high to other rice varieties in low K~ solution, and low to complete solution condition. In K~ deficient solution the "X-Z-N-1" has excecded about 1-2 times of K~ element accumulation and has higher contents of Na, Mg, Fe, Mn and Zn in plant than other rice varieties mentioned. In this paper the role of Na, Mg and Fe in supplement and replacement of K~ in K~ deficient condition has been disscussed.