外源黄体酮影响小麦根系伸长生长的生理调控途径OA

Progesterone is a steroid hormone found in plants,which is closely related to plant growth and development and plays a positive role in stress resistance.The growth status of wheat roots directly affects yield and stress resistance.This study investigated the effects of exogenous progesterone on the elongation growth of wheat roots and preliminarily analyzed their regulatory pathways.The results showed that different concentrations of exogenous progesterone exerted varying regulatory effects on wheat root growth:low concentrations(0.001 and 0.01 μmol/L)promoted root elongation,whereas high concentrations(0.1 and 1.0 μmol/L)inhibited growth.Exogenous progesterone treatment significantly affected the glucose content and phosphofructokinase(PFK)activity in the roots of wheat seedlings.With increasing progesterone concentration,the root glucose content first decreased and then increased,while the trend of PFK activity was opposite.Further research found that under 10 μmol/L glucose treatment,the root glucose content decreased and PFK activity increased;under 10 000 μmol/L glucose treatment,the root glucose content increased and PFK activity was inhibited.In addition,the application of 0.1 μmol/L progesterone significantly promoted root glucose accumulation under low-concentration glucose treatment and inhibited the induction effect of glucose on PFK activity.Conversely,the application of 0.001 μmol/L progesterone significantly inhibited root glucose accumulation under high-concentration glucose treatment and alleviated the inhibitory effect of glucose on PFK activity.These findings suggest that exogenous progesterone may affect the glycolysis process by acting on PFK,a key rate-limiting enzyme in the glycolytic pathway,thereby regulating the glucose content in roots and regulating wheat root elongation growth.