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Wheat Information
Service
Number 77: 25-28 (1993)
Monosomic
analysis for total and sterile floret number per spike in the
multispikelet line 10-A of common wheat
Y. L.
Zheng1, C. Yen2 and J. L. Yang2
1 Department of Agronomy, Sichuan Agricultural
University, Yaan City, Sichuan, 625014, P. R. China
2 Triticeae Research Institute, Sichuan
Agricultural University, Dujiangyan City, Sichuan, 611830, P. R.
China
Summary
Chromosome location of the genes for total and sterile floret
number per spike in the common wheat was carried out by using
multispikelet line 10-A and two sets of monosomic lines, Chinese
Spring and Abbondanza. The large number of total florets per spike of
10-A was controlled by the chromosomes 5A, 7A, 1 B, 2B, 2D and 6D,
but the genes on the chromosomes 1 B, 2B, 2D and 6D controlled mainly
the high number of sterile florets per spike. The useful value of
10-A was discussed in wheat breeding of increasing grain number per
spike as main objective.
Introduction
Yen et al. (1993) selected a common wheat, multispikelet line
10-A by using the genetic resources for large number of spikelets per
spike from rye. The large number of florets per spike results
entirely from increasing spikelet number per spike, and so this kind
of germplasm undoubtedly is very useful ideotype of increasing the
grain number per spike in wheat breeding (Zheng et al, 1992).
Unfortunately, the number of the sterile florets per spike of "10-A"
is much higher than that of the popular wheat varieties, resulting in
giving rise to the less grain number of "10-A". This study aimed to
locate the genes governing the total and sterile floret number per
spike of 10-A on certain chromosome.
Materials and methods
The tested line 10-A was selected from the offsprings of
backcrossing Triticale (8x) with common wheat by Yen et al.
(1993). Two sets of monosomic lines, Chinese Spring and Abbondanza,
were used in the monosomic analysis. From each monosomic line, two or
three monosomic plants were pollinated with 10-A. Three monosomic and
at least one disomic plants were mitotically selected from each
F1 hybrid. The selected F1 plants were observed
with respect to the total and sterile floret number per spike. Of the
each set, 21 F2 populations derived from monosomic
F1 hybrid for different chromosomes and one euploid
F2 population derived from disomic F1 plants
were included, and these two characters were investigated on 160
plants of each F2 population.
In
the statistic analysis of data, the number of total or sterile
florets per spike was maximum selected from the 5-8 observed spikes
of each sample plant. The significance of differences between the
mean values were detected by t-test. F-test was adopted to detect the
significance of the differences between the variances.
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