园艺学报 ›› 2003, Vol. 30 ›› Issue (6): 653-657.

• 研究论文 • 上一篇    下一篇


姜卫兵; 高光林; 戴美松; 韩浩章; 汪良驹   

  1. (南京农业大学园艺学院,南京210095)
  • 收稿日期:2003-01-23 修回日期:2003-04-08 出版日期:2003-12-25 发布日期:2003-12-25

Efects of Salt Stress on Diurnal Course of Photosynthesis of Young ‘Hosui’ Pear Trees with Di仃erent Rootstock

Jiang Weibing; Gao Guanglin; Dai Meisong; Han Haozhang; Wang Liangju   

  1. ( College of Horticulture,Nanjing Agricultural University,Nanjing 210095, China)
  • Received:2003-01-23 Revised:2003-04-08 Online:2003-12-25 Published:2003-12-25

摘要: 在盆栽及人工控制加盐条件下,用CIRAS-1型便携式光合测定系统研究了盐胁迫下不同砧木
‘丰水’梨幼树叶片光合日变化规律。结果表明:正常环境条件下梨叶片净光合速率(Pn)的日变化呈双峰型曲线,气孔导度(Gs)和蒸腾速率(Tr) 日变化呈单峰型曲线;盐胁迫改变了梨叶片光合特性日变化曲线,尤其是导致了Pn日变化曲线的整体下降;盐胁迫下梨光合日变化的改变受到不同砧木及不同盐处理水平的明显影响。另一方面,盐胁迫下,以杜梨为砧的丰水梨叶片Tr日变化与Gs呈线性相关,而以豆梨为砧的丰水梨Tr日变化与大气水汽压差(VPD)呈线性相关。此外,在上午相对较适宜的环境条件下,气孔性限制是梨光合作用的主限制因子,而在中午强光、高温和干燥条件下非气孔性限制则是主要的限制因子。

关键词: 梨, 砧木, 盐胁迫, 光合作用

Abstract: The effects of salt (NaCl) stress on diurnal course of photosyntIlesis of young ‘Hosui’ pear trees on two rootstocks with different salt tolerence。Pyrus betulaefolia and P.caueryana were studied by portable photosynthesis system CIRAS-1 with pot-grown grafting seedlings in soil salt-containing 0.3%,0.6% or no(control).The results showed that under natmal conditions(control),diumal course of net photosynthetic rate(Pn) in pear leaves presented two peaks,and daily variation of stomatal conductance(Gs)and transpiration rate(Tr)applied single peak;while salt stress resulted in changes of diumal variation of photosynthetic properties,especially whole decline of diurnal curve of Pn;and changes of diumal curve of photosynthetic chareactefistics(or the decline of Pn)were sharply afected by diferent rootstocks or salinity as wel1.On the other hand.under salt stress,diurnal variation of Tr had linear relations with variation of Gs in leaves of pear tres with rootstock P.betulaefolia,while diurnal variation of Tr had linear relations with variation of VPD in pear trees with rootstock P.caueryana .In addition。in the forenoon or aftemoon (under rather suitable environment)stomatal limitation was main inhibition factor ofphotosynthesis of‘ pear,while in midday(under higher light intensity and temperature and arid air) nonstomatal limitation was tnain inhibition factor.

Key words: Pear, Rootstock, Salt stres, Ph0tosynthesis