[Effect of natural stress on genetic diversity of Frankia in Alnus nodules].
The genetic diversity of Frankia in the nodules of Alnus nepalensis growing in different habitats of Jizu and Wuliang Mountains in Yunnan Province was studied by rep-PCR technique. The results indicated that the Frankia had an abundant genetic diversity, which was varied with different zones, altitudes and slopes. More genotypes of Alnus-infective Frankia were found at Jizu than at Wuliang Mountain. At the bottom of Jizu Mountain (2,300 m), the Shannon-Weiner index was 0.90, and increased with raising altitude, up to 1.33 at the top (2,700 m). The genetic diversity of Frankia was more abundant along the southern slope than the northern slope. It was concluded that the diversity index was positively related to natural stresses which were one of the important factors producing and maintaining the genetic diversity of Frankia.
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China.
Xiaomeng
X
Tang
Yumei
Y
Dai
Zhi
Z
Xiong
Zhongze
Z
Zhang
Chenggang
C
Zhang
D029661:Alnus / Q000382:microbiology*; D000531:Altitude; D040161:Frankia / Q000235:genetics*; D014644:Genetic Variation