根施不同浓度甜菜碱对水稻幼苗抗冷性的影响

Effects of different glycine betaine concentrations on cold resistance on rice seedlings by root application

研究不同浓度(2、4、8、16和32 mmol.L-1)的甜菜碱(glycine betaine)溶液根施48 h对水稻(OryzasativaL.cv.R239)幼苗抗冷性的影响。结果表明,与对照相比,各浓度处理均可提高幼苗的抗冷性,表现为提高了水稻幼苗的存活率,增加了叶绿素含量、根系活力、可溶性糖、可溶性蛋白质和脯氨酸含量;减缓相对质膜透性和削弱了丙二醛含量的积累。并在0到16 mmol.L-1浓度范围内其抗冷性随着浓度的升高而增加,32 mmol.L-1处理的幼苗表现出一定的伤害。

The seedings of rice （ Oryza sativa L. cv. R239） were treated with different glycine betaine （GB） concentrations for 48 h by root application. It showed that all different GB concentrations treatments enhanced the rice seedlings＇ cold resistance compared with the control. The survival ratio, chlorophyll content, root ability, protein, soluble sugar and praline content increased ; the MDA accumulation and the relative permeability of membrane reduced. Under the 16 mmol · L^-1 extension, the cold resistance of rice seedings was increased with the increase of different concentrations of GB, but the 32 mmol · L^-1 GB could damage rice seedlings.