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Scientia Silvae Sinicae ›› 2013, Vol. 49 ›› Issue (8): 108-116.doi: 10.11707/j.1001-7488.20130816

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Ontogenesis and Systematics Implications of Ginkgo biloba Chichi

Xing Shiyan, Zhang Qian, Fu Zhaojun, Liu Lijuan, Liu Xiaojing, Xin Hong, Wu Qikui   

  1. College of Forestry, Shandong Agricultural University Tai'an 271018
  • Received:2012-12-21 Revised:2013-03-01 Online:2013-08-25 Published:2013-08-17

Abstract:

Chichied ginkgo is a distinctive germplasm in ginkgo family. Ginkgo biloba chichi is divided into rooted chichi, stemmed chichi and branched chichi. There are 348 chichied ginkgo trees in China distributed in 19 provinces, and there are 43 plants in Japan. Chichied ginkgoes have no relations with gender but the most of chichied ginkgoes are older than 300 years. Chichi is coniform shaped with rough bark and grows vertically downward. These chichies can produce roots and leaves when they have grown down to the ground. Chichi on the tree can be a single appearance or a few aggregate. The tip of chichi has no apical meristem and only has cambium, secondary xylem and phloem. The median longitudinal sections exhibited various orientations of the tracheids at 1 cm from the tip of chichi. However, the sections revealed that tracheid orientation changed from being very variable in the centre to a more normal orientation as the cambium's at 7 cm from the tip. There are many theories on the chichi occurrence mechanisms, including Auxin theory, callus or adventitious bud theory, environmental mutagenesis theory, pathology or senility theory and cotyledon bud theory. Ginkgo biloba chichi probably has important ecology and systematics implications to the growth, development, vegetative propagation, wildness and long-lived of Ginkgo biloba.

Key words: Ginkgo biloba, anatomical characteristic, ontogenesis, auxin, systematics

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