Full TGIF Record # 4487
Item 1 of 1
Publication Type:
i
Report
Author(s):Shimizu, Norihiro; Komatsu, Toshinori
Author Affiliation:Pasture Plants Division, National Grassland Research Institute, Nishinasuno, Tochigi, Japan
Title:Studies on seed development and ripening in temperate grasses: IV. Seedling vigour in orchardgrass seeds during development and ripening under different temperature conditions
Source:Bulletin of the National Grassland Research Institute. Vol. 16, March 1980, p. 67-77.
# of Pages:11
Keywords:TIC Keywords: Lolium multiflorum; Lolium perenne; Seeds; Temperatures
Geographic Terms:Japan
Abstract/Contents:"Seed weight (or size) and stage of seed development and ripening are important factors affecting seedling vigour following germination. In the second report19) of the series, it has been found that orchardgrass had basically a similar pattern of seed development and ripening under any temperature conditions, while under high temperature condition (15 to 25°C), the length of seed development and ripening was progressively shortened with consequence of the diminished seed weight and size. The present investigations were undertaken to elucidate the seedling vigour in orchardgrass seeds harvested at various stages during seed development and ripening under two different temperature conditions (High=15 to 25°C; Low=10 to 20°C). To determine seedling vigour, the seeds were grown under natural environmental conditions during September to November, and the characters as the criteria for seedling vigour, such as first leaf length, number of tillers, number of leaves, plant height, leaf area, leaf weight, stem weight, plant top weight, leaf weight ratio, and specific leaf area were measured at the 3rd, 5th and 7th week after emergence. The results obtained were as follows; 1. The seedling emergence was dependent on the developmental stage of seed as shown in the second report 19) of this series. Emergence and survival seedlings were observed in the seeds harvested on and after the second developmental stage under both high and low temperature conditions. The seedling emergence was poor in the seed at the second developmental stage. The speed of emergence in the mature seed formed under high temperature condition was more rapid than that in the seed formed under low temperature condition. 2. First leaf length, plant height, leaf weight, stem weight and plant top weight showed significant difference between the seeds harvested at various stages during development and ripening under low temperature condition, while only the characters on weight of seedling, such as plant top weight, showed significant difference between the seeds under high temperature condition. Number of tillers, number of leaves, leaf weight ratio and specific leaf area showed non-significant difference between the seeds harvested at various stages during development and ripening under any temperature conditions. 3. In order to define the relationship between seedling vigour and developmental stage of seed, cluster analysis was applied to the seeds harvested at various stages during seed development and ripening under high and low temperature conditions, using the measurements of some characters related with seedling vigour. The seeds at the identical stage of development and ripening, except for the seeds at the third stage, were tightly clustered, under both high and low temperature conditions at development and ripening. The maximum seedling vigour was obtained in the seeds on and after the latter half of the third developmental stage, when the seed reached a maximum weight and a full size of embryo. 4. Leaf area, leaf weight, stem weight, and plant top weight were positively and significantly correlated with the seed weight or the embryo length within the seeds under identical temperature condition at development and ripening. The seed formed under high temperature condition produced more vigorous seedling per seed weight or per embryo length than the seed formed under low temperature condition, when using plant top weight as the criterion for seedling vigour. Consequently, though the weight and size of seed formed under high temperature condition were lighter and smaller than those under low temperature, they revealed essentially the same degree of seedling vigour."
Language:Japanese
References:24
Note:English summary as abstract
Tables
Graphs
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Shimizu, N., and T. Komatsu. 1980. Studies on seed development and ripening in temperate grasses: IV. Seedling vigour in orchardgrass seeds during development and ripening under different temperature conditions. (In Japanese) Bull. Natl. Grassl. Res. Inst. 16:p. 67-77.
Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=4487
If there are problems with this record, send us feedback about record 4487.
Choices for finding the above item:
Find Item @ MSU
MSU catalog number: SB 193 .A1 S6
Request through your local library's inter-library loan service (bring or send a copy of this TGIF record)