论文部分内容阅读
通过盆栽法,研究了不同浓度Na Cl胁迫对甜叶菊移栽苗生理生态特性的影响.结果表明:Na Cl对甜叶菊移栽苗生长的胁迫表现为低促高抑的效应,即0~44 mmol·L-1浓度下,Na Cl处理对甜叶菊移栽苗光合作用和生长具有促进作用;44~140 mmol·L-1浓度下,甜叶菊光合参数、干叶产量、长势等逐渐下降;大于140 mmol·L-1浓度下,甜叶菊将不能存活.低浓度Na Cl胁迫下,甜叶菊叶生长量增加,而茎和根的生长量与其他Na Cl胁迫一样,表现为增长量降低.甜叶菊通过增加叶生物量适应低盐胁迫,是甜叶菊叶子的增产新机制,为生物量的分配研究提供了新的佐证.此外,所确定的Na+影响甜叶菊生长的低促高抑的浓度范围,为今后甜叶菊规模化和精细化栽培种植提供了理论基础.
The pot experiment was conducted to study the effects of different Na (superscript +) concentrations on the ecophysiological characteristics of transplanted seedlings of Stevia rebaudiana. The results showed that the stress on the growth of transplanted Steppe seedlings was inhibited by NaCl, ie 0 ~ 44 Under the concentration of mmol·L-1, NaCl promoted the photosynthesis and growth of transplanted seedlings of Stevia rebaudiana. The photosynthetic parameters, dry leaf yield and growth rate of Stevia rebaudiana decreased gradually at the concentration of 44-140 mmol·L-1. Under the concentration of 140 mmol·L-1, stevia would not survive, while under low NaCl stress, the growth of stevia leaves increased, while the growth of stem and root was the same as that of other NaCl. Stevia adapted to low salt stress by increasing leaf biomass is a new mechanism for the increase of leaf production of Stevia, which provides a new evidence for the study of biomass allocation.In addition, the determined Na + concentration affects the growth of stevia Range, provide the theoretical basis for the future large-scale and fine cultivation cultivation of Stevia.