摘要
采用两个钙效率有较大差异的番茄品种(04,05)研究了缺钙胁迫对幼苗钙素吸收动力学特性、钙在体内的吸收和分配及幼茎解剖结构的影响。结果表明,正常供钙下不同钙效率番茄品种存在吸钙速率的基因型差异,钙低效品种04>钙高效品种05,经过缺钙胁迫后重新吸收钙的速率仍然以04>05。正常供钙下,钙低效品种04生长量、钙吸收量均显著高于钙高效品种05,而缺钙处理下植株生长量、钙吸收量、钙含量显著低于05。缺钙下两品种的根冠比增加,05增加程度高于04。正常供钙下两品种表皮细胞、薄壁细胞和形成层细胞形状大小匀称,排列紧密,04茎木质部导管数较多;缺钙使两品种幼茎形成层细胞发育受到影响,尤以04影响显著,表明缺钙胁迫对04品种结构的影响远远高于05。
Two tomato cultivars with different Ca efficiency were used to study the kinetic characteristics of Ca2+ absorption rate, Ca accumulation and distribution in plant under Ca stress in tomato seedlings. The anatomical structure of stem was also studied at the same time. Results showed that there was a genotype difference in absorption of Ca between the different Ca efficiency tomato cultivars. The Ca2+ absorption rate of Cainefficiency cultivar 04 was higher than that of the Cainefficiency cultivar 05 under both sufficient Ca treatment (CK) and Ca deficiency treatment (Ca). In normal Ca supply condition (CK), Cainefficiency cultivar 04 had higher growth rate, Ca absorption rate and Ca content in seedlings than cultivar 05 while these indices were lower than those of 05 under Ca deficient condition. The ratio of R/S increased under Ca deficiency stress in both cultivars and the degree of the increase in 05 was larger than that in 04. In control the shape and size of epidermal cells and cambial cells of the young stem were uniform and the cells were regularly arranged and the xylem pipes of cultivar 04 were larger and more than that of 05. In the condition of Ca deficiency the development of these cells was affected significantly especially for Cainefficient cultivar which indicated that it was influenced greatly more than Caefficient cultivar when suffered by the Ca stress.
出处
《植物营养与肥料学报》
CAS
CSCD
北大核心
2003年第2期233-237,共5页
Journal of Plant Nutrition and Fertilizers
基金
中国科学院南京土壤研究所所长基金项目(BR0007)资助。
关键词
番茄
钙效率
幼苗钙吸收
幼茎解剖结构
缺钙胁迫
tomato
Ca efficiency
dynamics
Ca absorption
young shoots
anatomic structure
