Studies on cold hardiness of grapevine roots

Authors

  • Xiu-Wu Guo
  • Wang-Heng Fu
  • Guang-Jie Wang

DOI:

https://doi.org/10.5073/vitis.1987.26.161-171

Keywords:

cold, resistance, frost damage, analysis, histology, root, variety of vine, rootstock, China

Abstract

  1. For 16 grapevine rootstocks, the critical chilling temperatures were determined. There were great differences in cold hardiness among these vines. The cold hardiness öf several newly introduced rootstocks was higher than that of rootstock variety Beta and they showed even multiple resistance. Thus, after further testing experiments, they might become valuable rootstocks in cold regions.
  2. There were some differences in cold hardiness among 3 fruiting varieties tested. This finding can be used as reference in formulating winter protection measures for own-rooted grapes.
  3. Comparative examination of the methods for testing cold hardiness showed that the combination of electrolytic conductance method with root section culture was simple and reliable for measuring cold hardiness of grape roots, while TTC reduction method, because of its Jack of regularity in test results, was not suitable for this purpose.
  4. The characteristics of root structure have certain correlations with cold hardiness:
    (i) Varieties with higher cold hardiness have smaller hark and ray cells than tender varieties and their tissue structure is more compact.
    (ii) Vessel diameter is smaller and vessel density is lower in hardy varieties.
    (iii) Varieties with higher cold h ardiness have a lower percentage of hark and a higher rate of xylem in their roots.
Thus, these characteristics of root structure could be used as an additional index in forecasting and screening cold hardiness of grape roots.

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Published

2015-12-16

Issue

Vol. 26 No. 3 (1987): VITIS

Section

Article

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