A Database for Triticeae and Avena
II. 18. Relation between kernel row number and crude protein content
of the grain in barley.
S. Yasuda and I. Moriya, The Ohara Institute for Agricultural Biology,
Okayama University, Kurashiki 710, Japan.
A comparative study of the effects of two-rowed alleles on some agronomic
characters was made by the use of a number of isogenic pairs differing
only in Vv (Takahashi et al. 1975). It was indicated in the results
that the two-rowed strains were about 2 per cent higher in an average in
crude protein content of the grains than the corresponding six-rowed strains.
In order to know its underlying physiological cause, this experiment
was performed using 2 pairs of isolines (KT-16, KA-26) which were space-planted
in mid-November in a field at Kurashiki. For six-rowed plants, date of
anthesis was tagged on a single ear basis, and removal of lateral florets
or grains was made for one of the two ears within plant which flowered
on the same date. The removing treatment was made first on one or two days
before anthesis and every five days interval on 5th to 25th day after anthesis.
One-half of the ears within plant was used for treatment, and another half
of them remained untreated and used for comparison. Each plot consists
of five plants involving each at least 7~ 10 ears within plant for both
intact and removed laterals. After ripening, intact and treated ears of
each plant were separately harvested, weighed for 1000 kernel weight, and
measured for crude protein content of the grain on a single plant basis.
As seen in Fig. 1, the increasing effect of the removal of laterals
on crude protein contents was most evident when the treatment was made
before anthesis; the crude protein content of this plot being almost the
same as that of the corresponding two-rowed strains. But, the increase
of crude protein content became smaller and smaller with the later date
of treatment, and then the treated plot reached the same crude protein
content as the intact plot on 25th day after anthesis. Removal of laterals
affected only a little on 1000 kernel weight, and earlier removal seemed
to result in a slight increase only for KT-16 strain.
Figure 1. Changes of crude protein content and 1000
kernel weight (histogram) in intact (black) and removed (white) lateral
spikelet plants of barley.
The results obtained as to crude protein content in this experiment
may be explained as follows: nitrogen absorbed from the roots is distributed
almost uniformly to central and lateral spikelets in intact six-rowed head,
but when lateral spikelets have been removed from the head, the nitrogen
which is allotted to the lateral spikelets will be distributed to and accumulated
excessively in the central spikelets.
BGN 12 toc
BGN Main Index