云南稻核心种质光壳稻耐低磷特性研究

A study on ability of tolerance to low phosphorus of nuda rice of Yunnan core collection

在土壤有效磷6．26×10^-4和40×10^-4条件下对云南地方稻核心种质40份光壳稻和495份具稃毛稻种（非光壳）进行耐低磷特性比较，初步结论如下：（1）光壳稻的耐低磷强弱与籼粳程氏指数有一定联系，强耐低磷品种主要分布在偏籼和偏粳的中间型陆稻。（2）光壳稻平均耐低磷力显著低于其他稻，耐低磷力由籼至粳到光壳依次递减，呈连续性变异。（3）耐低磷强弱与稃毛有无、籼粳分化密切相关。

Ability of tolerance to low phosphorus of 40 accessions nuda rice and 495 accessions rice （having glume pubescence） of Yunnan rice core collectionwere evaluated and compared when planted in P-deficient （effective P： 6.26 mg/kg） and P--sufficient （effective P： 40 mg/kg） acid red soil. The main results are as follows： （1） The extent of tolerance to low-P of nuda rice was associated with Indica -Japonica classification index; P-deficiency tolerance of midst type （indicaclinous and japonicaclinous type ） was more than that of japonica type , and more of midst type were tolerant to low phosphorus. （2） Average of ability of tolerance to low phosphorus was in turn Indica 〉 Japonica 〉 nuda rice , taking on degressive current and consecutive variance. （3） The ability of tolerance to low-P was associated with Indica -Japonica classification and glume pubescence.It is suggested that there were cooperative evolvement connection between the ability of tolerance to low-P and the Indica -Japonica differentiation.