摘要
以碱性紫色土盆栽4种柑桔砧木实生苗(枸头橙、酸桔、红(木黎)檬和枳),分别接种菌根真菌(Glomus citricolum),以不接种菌根为对照,施入放射性^(55+59)Fe盐来示踪探明菌根对柑桔吸收铁素的效应。处理 4个月后,4个品种实生苗的苗根发育均良好,有菌根苗的地上部鲜重和干物重比无菌根苗的分别增长2.2～4.7倍。每株苗施入^(55+59)FeSO_4等量64μci,70天后,菌根使柑桔苗地上部铁素增强2～4倍。4个品种中以红(木黎)檬实生苗吸收的铁量最多,但有菌根苗地上部干物重和放射性强度与本品种无菌根苗的比值大小,即菌根对各种砧木效应的大小依次同样是酸桔>枸头橙>红(木黎)檬>枳。
The purpose of this experiment is to determine whether the VA mycorrhizal fungus,Glomus citriculum, is beneficial to certain citrus species for correcting iron-deficiency chlorosis. Seedlings of 4 citrus species, C.aurantium, C. limonia, C. reticulata,and P. trifoliata, were grown in pots with alkaline purple soil. The soil was irradiated with γ-ray to kill indigenous fungi and irrigated with Hoagland's solution devoid of iron.Radio isotope 55 + 59Fe was used for labelling the iron at the rate of 64 μci to each plant.
Four months after inoculation with this mycorrhizal fungus, the roots of the seedlings of all these 4 citrus species were well infected, indicating that Glomus citriculum is an efficient encophyte in purple soil. The growth of the inoculated seedlings was significantly more vigorous than those not inoculated as shown by an increase in shoot height and weight of 1.2~2.0 times. 70 days after the application of labelled ferrous sulphate, the radio-activity of the mycorrhizal seedlings was 2~4times stronger than the non-mycorrhizal ones.These results lead to the conclution that this mycorrhizal fungus promotes iron uptake by these 4 citrus species, especially in the case of Citrus limonia.
出处
《园艺学报》
CAS
CSCD
北大核心
1990年第4期257-262,共6页
Acta Horticulturae Sinica
基金
国家自然科学基金资助项目
关键词
柑桔
真菌
VA菌根
铁素
VA mycorrhizal fungus
Iron-deficiency chlorosis
