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。
Malus xiaojinensis seedlings grew normally without any iron chlorosis symptom at soil pH 7.8 and its leaf chlorophyll content was much higher than that of control species M. rockii, which showed severe chlorosis under the same pH conditions. Mild but typical iron chlorosis symptom was observed in scion leaves of M. xiaojinensis 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 chlorosis symptom disappeared. The rate of root H+ excretion and ferric-chelate reductase activity increased in M. xiaojinensis 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. xiaojinensis provided an optimum pH environment for root FCR.
出处
《园艺学报》
CAS
CSCD
北大核心
2003年第6期639-642,T001,共5页
Acta Horticulturae Sinica
基金
科技部转基因植物与产业化专项课题(Joo-A-008-07)
