The Compatibility and Fruit Growth Dynamics of the Cross between Rhododendron decorum and R.irroratum
The cross between Rhododendron decorum and R.irroratum was conducted.Its cross feasibility was analysed by measuring the ratio of male style length of R.irroratum to the female style length of R.deco-rum.Fluorescence microscope was used to study the process of pollen sprouting and pollen tube growth of R.ir-roratum after crossing to ensure the cross compatibility.The hybrid fruit growth dynamics of the crosses were observed and analyzed at different development stages after pollination under the conditions of greenhouse and outdoors separately,the results showed as follows,the ratio of male style length of R.irroratum to the female style length of R.decorum was 0.98 which indicated that the cross between R.decorum and R.irroratum in-clined to success.The cross compatibility was proved by the fact that the pollen tube of R.irroratum entered the ovules of R.decorum and then the fertilization happened at 9d after pollination according to the observation of Fluorescence microscope.The morphological mature period of both the hybrid fruits under two separate cultiva-tion conditions was about 180 d,in which,after pollination,0-9 d was the first slow growth period,9-105 d was the first fast growth period,105-135 d was the second slow growth period and 135-180 d was the second fast growth period.The growth dynamic changes of the vertical and horizontal diameters of the fruit were similar but the dynamic growth curve of horizontal diameter was gentler than that of the vertical diameter.The results indicated that the cross between Rhododendron decorum and R.irroratum was compatible and the hybrid fruit growth curve belonged to the double “S” curve.Moreover,the size of the vertical and horizontal diameters of the hybrid fruit at the morphological mature time was directly related to the cultivation conditions.
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维普
