Effect of Low Night Temperature on Reproductive Organ Development in Relation to Pollen Viability of Bell Pepper

서지정보

· 발행기관 : 한국생명과학회
· 수록지 정보 : 생명과학회지 / 19권 / 5호 / 581 ~ 586페이지
· 저자명 : 임채신

초록

Bell pepper plants (Capsicum annuum cv. Plenty) were grown under low night temperatures (LNT: day/night temperature of 28/13oC) and optimum night temperatures (ONT: day/night temperature of 28/20oC) in growth chambers. Pollen grains were collected from plants in the growth chamber and incubated at 10, 15, 20, 25, and 30oC. After 24 hr incubation, in both ONT and LNT, the highest percent pollen germinations were observed at 25oC followed by germinations at 30oC. Percent pollen germination at 25oC was 42% in ONT - two times higher than in LNT at 21%. Pollen tube length was much longer at ONT than at LNT, regardless of incubation temperature. Compared with other treatments, earlier and quicker pollen tube elongation was observed in ONT pollen grains incubated at 25oC. To find pollen viability in plant growing conditions, pollen grains were incubated in LNT (28/13oC) and ONT (28/20oC) growth chambers for 24 hr. Petri-dishes with pollen grains were put in the growth chambers at the beginning of the night condition. Pollen grains in the LNT growth chamber did not germinate at night (13oC), but began to germinate when the day condition (28oC) started. Pollen grains in the ONT condition, however, started germinating from the early night (20oC) and germination continued during the day (28oC). Plants in LNT showed increased flower stalk length, ovary diameter, stamen length, flower weight, and fruit length. LNT conditions did not impair seed set. There were no differences in seed sets between fruits at LNT and ONT. Normal seed sets in LNT show that fertilization may be completed during daytime. However, further investigation is needed to find what extent of temperature stress causes malformed and/or parthenocarpic fruits in this bell pepper.

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