Volume 30 Number 1 Article 34 Pages: 31-31
Year 1976 Month 1
Title: The Development of Male Gametophyte in situ Under Selfing and Cross-Pollination in Sex Genotypes of Tetraploid
Authors: E.H. Bowerman and G. Jelenkovic
Citation
Abstract:
The fluctuation of fruit productivity
in some cultivated blueberries, Vaccinium
corymbosum L., is a major
problem in New Jersey.
The amount
of fruit produced by the cultivars,
'Earliblue', 'Coville', and 'Jersey' is
inconsistent from year to year, while
the cultivars, 'Bluecrop', Weymouth',
and 'Blueray', have consistent production.
The purpose of this investigation
was: first, to establish the effect of
pollen population on the setting capacity
of different varieties; second, to
ascertain to what extent pollen source
may alter the setting in cultivated
genotypes, and third, functionability
of the female apparatus in reciprocal
crosses of the six cultivated genotypes.
To establish this, the growth of the
pollen tubes in the stylar tissue was
studied and related to the seed and
fruit set.
In the pollen tube and seed set
study, an unbalanced complete block
design with reciprocal diallele crosses
was used.
The pollen tube counts
were made at three different rates of
pollen.
Each treatment was replicated
twice.
The results reported here are the
number of pollen tubes per style
under greenhouse conditions and the
number of seed per berry under field
conditions.
In the pollen tube study a significant
difference at the 1% level was
found amon the maternal genotypes, the paternal genotypes, and the degree
of interaction between the
crosses.
The rank of the maternal
genotypes according to the number
of pollen tubes per style was 'Bluecrop'
(a); 'Weymouth' (b); 'Blueray'
(b); 'Coville' (c); 'Earliblue' (d); and
'Jersey' (e). The results of increasing
the number of pollen grains applied
to the stigmatic surfaces was a linear
increase in the number of pollen tubes
contained in the styles.
The fruits of the cultivars 'Tersey'
and 'Coville' contained a significantly,
smaller number of seeds than the other
genotypes.
The seed number per fruit
of each maternal genotype was influenced
significantly by each paternal
genotype.
The average correlation coefficient
between the number of pollen
tubes per style and the number of
seed per fruit was .32.
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