Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Study on cold tolerance of introduced walnut seedlings under natural cold stress.

Abstract

Taking seedlings of 7 introduced walnut cultivars and 1 local cultivar as samples, preliminary assessment on their cold tolerance was conducted through analyzing 3 physiological and biochemical indexes under natural cold stress. The results showed that with the decrease of natural temperature, 3 indexes namely relative electrical conductivity, MDA and proline content tended to increase. However, the increase extents were different among the cultivars. Based on comprehensive analysis of all 3 indexes, 8 cultivars were divided into 3 groups according to their cold tolerance. The group I with 2 introduced cultivars Buccaneer and Axel showed high cold tolerance, next came group II with 4 cultivars Coenen, Parisienne, Hanson and Juglans sigillata, and group III with 2 introduce cultivars Lara and Fernette showed the lowest tolerance.