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园艺学报 ›› 2007, Vol. 34 ›› Issue (6): 1341-1346.

• 果树 •    下一篇

低磷胁迫下平邑甜茶根构型与磷吸收特性的变化

范伟国;杨洪强*;韩小娇   

  1. (山东农业大学园艺科学与工程学院,作物生物学国家重点实验室,山东泰安 271018)
  • 收稿日期:2007-04-09 修回日期:2007-08-27 出版日期:2007-12-25 发布日期:2007-12-25
  • 通讯作者: 杨洪强

Changes of Root Architecture and Phosphorus Uptake by Roots of Malus hupehensis(Pamp) Rehd. under the Condition of Phosphorus-deficiency

FAN Wei-guo,YANG Hong-qiang*,and HAN Xiao-jiao   

  1. (College of Horticulture Science and Engineering, State Key Laboratory of Crop Biology, Shandong Agricultural University,Tai,an, Shandong 271018, China)
  • Received:2007-04-09 Revised:2007-08-27 Online:2007-12-25 Published:2007-12-25

摘要: 为揭示苹果适应低磷胁迫的机制,以平邑甜茶[Malus hupehensis (Pamp)Rehd.]为材料,采用水培方式研究了缺磷和复磷条件下根系磷吸收和根构型参数的变化。结果显示,平邑甜茶幼苗在缺磷营养液中培养120 h期间,根系磷最大吸收速率始终高于对照,并趋向一个较稳定的差值;缺磷处理最初12 h内根系磷吸收米氏常数Km值提高,但72~120 h明显下降。缺磷处理的平邑甜茶幼苗转到完全营养液中培养12~120 h,根系对磷的转运效率影响不大,而与磷的亲和力下降,并逐渐恢复到正常状态。平邑甜茶幼苗在缺磷条件下培养至11 d时,一级侧根总长度低于对照,但在17~26 d时,一级侧根总长度明显提高。结果表明,平邑甜茶在短期内主要通过磷吸收动力学的变化来适应缺磷胁迫,较长时期则通过根构型的变化来适应。

关键词: 平邑甜茶, 根构型, 磷亏缺, 吸收动力学

Abstract: To probe into the adaptive mechanism of apple to phosphorus deficiency, a systematic study was made, with Malus hupehensis(Pamp) Rehd adopted as materials and by means of water-culture approach, about the dynamic changes of uptake of phosphorus by roots and root architecture parameters of M. hupehensis R. under the condition of P-deficiency and re-supplied P. Our results revealed that the greatest rate of absorption (Imax) of M. hupehensis R. young seedling in P-deficiency nutrient solution was constantly higher than that of M. hupehensis R. young seedling in full Hoagland solution, and tends to be relatively stable in 120 h; Michaelis constant (Km) went up during 0-12 h, but obviously decreased between 72 to 120 h. In contrast, the effect of root system on the phosphorus transport efficiency in not remarkable, but the phosphorus affinity decreased and gradually returned to normal from 12 h to 120 h when the plants cultivated in P-deficiency solution were transplanted into and stayed in the full Hoagland solution. In addition, the lengths of primary lateral roots in P-deficiency solution were shorter than that of primary lateral roots in full Hoagland solution on the 11th day, and obviously increased from 17th day to 26th day. The results demonstrated that the adaptation of M. hupehensis R. to the condition of phosphorus-deficiency was realized by the changes of parameters of P uptake kinetics during a short time and by the changes of root architecture during a long time.

Key words: Malus hupehensis(Pamp) Rehd., Root architecture, Phosphorus deficiency, Uptake kinetics

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