摘要
以小金海棠和山定子为试材，通过不同供铁水平对其铁离子吸收动力学参数影响的研究，探讨这二个苹果基因型的铁吸收动力学特性及铁高效苹果基因型的筛选指标。结果表明：小金海棠、山定子幼苗对铁离子的吸收均符合离子吸收动力学；与山定子相比，小金海棠对铁有较强的吸收能力。在相同供铁水平下，小金海棠Ｋｍ值＜山定子Ｋｍ值，小金海棠Ｉｍａｘ值＞山定子Ｉｍａｘ值。由此说明，小金海棠对铁素的亲和力较高、吸收能力较强，属于铁高效基因型；离子吸收动力学参数可作为铁高效苹果基因型植物的筛选指标。
Iron deficient chlorosis is one of the major physiological disorders for horticultural crops, particularly on calcareous soils. One of the most available means to ammoliate it is to screen Fe-efficient species or cultivars. Mains xiaojinensis Cheng et Jiang (a Fe-efficient species) and M. baccata (L.) Borkh. (a Fe-inefficient one) were used in this experiment to compare differences of growth and iron absorption kinetics between these two species, with the aim to study iron absorption characteristics for both species and screen promising screening parameters for iron efficient genotype. The results showed that M. xiaojinensis had more root and seedling growth and higher amount of absorbing Fe than M. baccala iron uptake rates of intact roots for both species were found to follow the Michaelis-Menten curve. The results obtained lead to the conclusion that being Fe-efficinet species in Malus, particularly under Fe deficiency stress condition, M.xiaojinensis had higher afinity with iron and greater Fe absorption rate. Also,Km and Imax could be used as a useful predicting parameter for screening Fe-efficient genotypes.
出处
《园艺学报》
CAS
CSCD
北大核心
1995年第4期313-317,共5页
Acta Horticulturae Sinica
基金
国家自然科学基金
北京市自然科学基金
国家教委优秀青年教师基金农业部"八五"重点资助
关键词
铁
苹果
基因型
离子吸收动力学
Iron (Fe)
Malus species
Fe absorption kinetics
K_m
I_(max)
