园艺学报 ›› 2003, Vol. 30 ›› Issue (6): 639-642.

• 研究论文 • 上一篇    下一篇


李 凌1; 周泽杨2; 裴 炎2   

  1. ( 1西南农业大学园艺园林学院,重庆400716; 2西南农业大学生物技术中心,重庆400716)
  • 收稿日期:2003-02-24 修回日期:2003-05-12 出版日期:2003-12-25 发布日期:2003-12-25

Physiological Reaction on Resistance to Iron Chlorosis in Malus xiaojinensis and M .rockii

Li Ling1; Zhou Zeyang2; Pei Yan2   

  1. ( 1Horticulture and Garden College,Southwest Agricultural University, Chongqing 400716,China; 2Biotechnology Research Center Southwest Agricultural University,Chongqing 400716, China)
  • Received:2003-02-24 Revised:2003-05-12 Online:2003-12-25 Published:2003-12-25

摘要: 小金海棠实生苗在pH 7.8的碱性紫色土上生长正常,丽江山荆子实生苗表现严重的缺铁失绿;相同土壤上的丽江山荆子砧上的小金海棠叶片会出现明显的缺铁失绿现象,而小金海棠砧上的丽江山荆子的叶片却没有缺铁症状出现。小金海棠在缺铁培养下,根系的质子分泌和三价铁螯合物还原酶(FCR)活性均被诱导增加,而且均明显强于同样培养条件下的丽江山荆子;小金海棠的根系质子分泌部位和FCR活性增强的部位重叠。

关键词: 苹果属, 小金海棠, 丽江山荆子, 缺铁胁迫

Abstract: Malus xiaojinemis seedlings grew normally without any iron ehlorosis symptom at soil pH 7.8 and its leaf chlorophyll content was much higher than that of control species M.rockii. which showed severe ehlorosis under the same pH conditions.Mild but typical iron ehlorosis symptom was observed in scion leaves of M.xiaojinemis grafted on M.rockii rootstock in the field with pH 7.8. Conversely,when M .rockii was exploited the scion and grafted on M.xiaojinenesis rootstock, its iron ehlorosis symptom disappeared.The rate of root H+ excretion and ferric-chelate reduetase activity inereased in M.xiaojinemis and were substantially higher than that of M.rockii under iron deficiency.The part of root H+ excretion overlapped with the functioning region of root FCR, It is hypothesized that the high root H+ excretion in the absorptive parts in the roots of M.xiaojinemis provided an optimum pH environment for root FCR.

Key words: Malus, Malus xiaojinemis, Malus rockii, Resistance to iron chlorosis