. Citrus fruits; an account of the citrus fruit industry, with special reference to California requirements and practices and similar conditions . Fig. ?anzo). — Variegated sporf. Note white areasVolckamers Hesperides, 1695. leaves. From Sectorial chimeras are not uncommonly met with incitrus trees. The writer has found excellent specimensin commercial orchards and some have been kept under » An. del. Stazione de Agrum. e. Fruit. Vol. 1, 1911, XXIX. 122 Citrus Fruits constant observation and study for five years. A Valen-cia orange tree in an orchard near Whittier was evidentlypropagated from
. Citrus fruits; an account of the citrus fruit industry, with special reference to California requirements and practices and similar conditions . Fig. ?anzo). — Variegated sporf. Note white areasVolckamers Hesperides, 1695. leaves. From Sectorial chimeras are not uncommonly met with incitrus trees. The writer has found excellent specimensin commercial orchards and some have been kept under » An. del. Stazione de Agrum. e. Fruit. Vol. 1, 1911, XXIX. 122 Citrus Fruits constant observation and study for five years. A Valen-cia orange tree in an orchard near Whittier was evidentlypropagated from a bud with mixed cells, for it still bearsyear after year on all its branches both typical Valenciaoranges and a small, very rough, and worthless twig here and there will produce typical Valencias, while. Fig. 40. — A variegated sport of Valencia orange. Notice white marginof others will produce curious mLxed oranges having certainsectors of the fruits composed of mutant tissue. Theowner of this tree endeavored to get rid of the worthlesstype by pruning it out, but mutant branches continuallyreturned, and it requires frequent pruning to keep themsuppressed. In this case the mutant tissue happens tooccur irregularly scattered or mixed with the tissue of the Improvement of Citrus Trees by Breeding 123 original form. Such a mixture has been called a hyper-chimera. Mutations often occur in the cells which begin theformation of the minute ovaries in the blossom buds. Asthe ovary grows in size the mutation appears as a sectorof the fruit which differs in color, ripening season, or thick-ness of skin from the rest of the fruit. Such curiousfruits have been called spontaneous chimeras. Thesestriped oranges and lemons are often found by the pickers,who usually incorrectly attribute the phenom
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcitrusfruits, bookyea
