Full TGIF Record # 6519
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Author(s):Yumoto, Setsuzo; Shimamoto, Yoshiya; Tsuda, Chikahiro
Author Affiliation:Faculty of Agriculture, Hokkaido University, Sapporo, Japan
Title:Studies on ecotypic variations among natural populations of timothy. III Growth response to high temperature
Source:Journal of Japanese Society of Grassland Science. Vol. 28, No. 1, 1982, p. 1-7.
# of Pages:7
Keywords:TIC Keywords: Phleum pratense; Heat resistance
Abstract/Contents:"In order to investigate the ecological differentiation of timothy (Phleum pratense L.) in growth response to high temperature, twenty natural populations collected from some areas in Hokkaido (Fig. 1) and three cultivars were grown during the summer in Sapporo. Their seedlings were grown in pots in unheated greenhouse (high temperature plot) and outdoor (control plot). Several characters on the main stem and number of tillers were measured on five plants per plot. Based on the principal component analysis of response index ([(mean of high temperature plot mean of control plot)/mean control plot]×100) of leaf size (Table 1), twenty natural populations were classified into two groups (groups I and II, Fig. 2). In the group I, which consisted of four populations from the area west of Hidaka Mountains, leaf growth was promoted under high temperature conditions (Fig. 3). The group II included the other sixteen populations and except for one population they were collected from the area east of Hidaka Mountains. In these populations leaf growth tended to be inhibited by high temperature. In cultivars the leaf growth inhibition by high temperature was more evident than in natural populations. While the group I had the more elongated stem and quickened heading date in high temperature plot, the group II did the more shortened ear and delayed heading date (Fig. 4). Cultivars showed the most shortened ear among three groups in high temperature plot. These experimental results suggested that populations of the group I had wider range of tolerance to high temperatures than those of the group II or cultivars. The differences of natural populations in high temperature tolerance were discussed in relation to climatic conditions of their habitats."
Note:Summary appears in English
Summary appears as abstract
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Yumoto, S., Y. Shimamoto, and C. Isuda. 1982. Studies on ecotypic variations among natural populations of timothy. III Growth response to high temperature. (In Japanese) Journal of Japanese Society of Grassland Science. 28(1):p. 1-7.
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