Influence of temperature, time of day, and flower age on pollen germination, stigma receptivity, pollen tuber growth, and fruit set of Allium cepa L.

Influence of temperature, time of day, and flower age on pollen germination, stigma receptivity, pollen tuber growth, and fruit set of Allium cepa L.

1976

A:PS

Male fertile lines M 611B and P 52-371B and male-sterile lines M 2399A and P 54-306A of onion were grown in 3 chambers in the Biotron with maximum temperatures of 24 C, 35 C and 43 C and a minimum of 18. Temperature and flower age affected longevity and viability of pollen. There was no striking difference in % germination between the 2 male-fertile lines in time of day pollen was collected from flowers of the same age. At 24 C stigma respectivity was highest on the 4th day; at 35 C, the 3rd day; and at 43 C, the 1st day after anthesis. Pollen started germinating 1/2 hour after placement on the stigma at the 3 temperature. Pollen tubes grew the entire length of the style within 12 hours after pollination. The highest % fruit set was at 35 C. Seeds per ovary were 2.57, 3.20, and 1.66 for 24 C,35 C, and 43 C, respectively. [AS]

v.101(1):81-83, AMERICAN SOCIETY FOR HORTICULTURAL SCIENCE, JOURNAL

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