رشد لوله گرده و درصد ميوه بندي دو رقم زردآلو در شرايط خود و دگرگرده افشاني

POLLEN TUBE GROWTH AND FRUIT SET PERCENTAGE IN TWO APRICOT CULTIVARS UNDER SELF AND CROSS-POLLINATION CONDITIONS.

To investigate the effect of different pollen grains on pollen tube growth and fruit set in ʹGhermez-e-Shahroodiʹ and ʹGhorban-e-Maragehʹ apricot cultivars, an experiment was conducted under controlled pollination under lab and field conditions. In addition to assessment, in vitro pollen germination, initial and final fruit set and also fruit drop were determined after self- or cross-pollination. In order to measure the number of pollen tubes at the end of style and in the ovary, pollination was performed in a growth chamber under controlled temperature, humidity and photoperiod condition. Seventy two hours after pollination, pistils were harvested and fixed in FAA. The pistils were washed and placed in an autoclave in 5% sodium sulfite solution to softer the flowers. After staining with aniline blue, pistils were examined under fluorescence microscope. Results showed significant differences for all the traits in the cultivars studied. The highest fruit set percentage and the number of pollen tubes at the end of style and in the ovary was observed in ʹGhorban-e-Maragehʹ. However, ʹGhermez-e-Shahroodiʹ showed the highest number of fruit drop. No significant differences were observed in the number of pollen tubes at the end of style and in the ovary as well as fruit set percentage under self- or cross-pollination. Interaction between cultivar and pollen sources for final fruit set and the number of pollen tubes at the end of style was significant but was not significant for other characteristics.