New Zealand Journal of Crop and Horticultural Science abstracts
Short communication: Some observations on the influence of temperature
on the germination of pollen on excised nashi (Pyrus serotina Rehder
var. culta Rehder) flowers
B. H. ROHITHA
D. J. KLINAC
The Horticulture and Food Research Institute
of New Zealand
Ruakura Research Centre
Private Bag 3123
Hamilton, New Zealand
Abstract Pollen germination on excised nashi (
Pyrus
serotina Rehder var.
culta Rehder) styles was compared at six
constant temperatures (4, 17, 12,16, 20, and 25deg.C). After 24 h pollen
germination was highest at 12deg.C for the cultivar `Shinsui'. For the
cultivars `Hosui', `Kosui', `Nijisseiki', and `Shinseiki', the optimum
temperature for pollen germination was between 16 and 20deg.C. The
(green-skinned) cultivars `Nijisseiki' and `Shinseiki' showed higher levels of
pollen germination and a higher optimum temperature than the (russeted)
cultivars--`Hosui', `Kosui', and `Shinsui'. Field temperatures over the
flowering period were lower than these
in vitro optima, and so may have
contributed to the varying levels of seed set observed.
Keywords nashi, Asian pear; Pyrus serotinia;
pollination; seed set; temperature; pollen
New Zealand Journal of Crop and Horticultural Science, 1994, Vol. 22:
339-342
0114-0671/94/2203-0339 $2.50/0 (c) The Royal Society of New Zealand
1994
PDF file of entire paper: medium quality (847K); (scanned from paper original: notes about this process)
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