. Citrus fruits; an account of the citrus fruit industry, with special reference to California requirements and practices and similar conditions . ay reach the ovule as soon as 30hours after pollination. Fusion of male and female cellsmay begin 48 hours after pollination. Fertilization iscompleted in from 48 to 72 hours after pollination. 7. In the Washington Navel and Satsuma oranges theembryo-sacs usually disintegrate instead of developinginto embryos capable of being fertilized. Occasionally a few normal embryo-sacs are producedin both Washington Navel and Satsuma oranges.^ Thus 1 Tomochika
. Citrus fruits; an account of the citrus fruit industry, with special reference to California requirements and practices and similar conditions . ay reach the ovule as soon as 30hours after pollination. Fusion of male and female cellsmay begin 48 hours after pollination. Fertilization iscompleted in from 48 to 72 hours after pollination. 7. In the Washington Navel and Satsuma oranges theembryo-sacs usually disintegrate instead of developinginto embryos capable of being fertilized. Occasionally a few normal embryo-sacs are producedin both Washington Navel and Satsuma oranges.^ Thus 1 Tomochika Ikeda, On the Parthenocarpy of Citrus Fruits,Jour. Sci. Agr. Soc. Tokyo, Vol. 63, 1904. ^ The factors which influence the frequency of occurrence of Citrus Botany, Gross Structure, and Habits of Growth 57 a few seeds may be prochicefl provided the particular fruitshaving the normal embryo-sacs happen to be pollinatedwith viable pollen from congenial varieties. It is theremoteness of the chance of this occurring under ordinaryfield conditions that accounts for the comparative seedless-ness of these fruits. Apparently there is nothing in the. Fig. 14 Orange flower X 2 /;, pi^til, a, stigma ; c, styles, stamen; b, anther; c. filament, d, riectai> ovary;a, sepal; /, petal. structure of the blossoms of either the Washington Xavelor the Satsuma orange which would interfere in any way normal embryo-saes have not been fully worked out. Experi-ments now being carried on by the writer seem to indicate thatthe climate factor is most important. Normal embryo-sacs ofWashington Navels occur much more frequently at Riversidethan at Whittier where they are very rare. For this reason plant-breeders wishing to use the Navel as a maternal parent in cross-breeding work may greater results from crosses made atRiverside or other interior points. 58 Citrus Fruits with the germination of pollen or normal extension of thepollen tube. The occasional seeds sometimes found in WashingtonNavel o
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcitrusfruits, bookyea
