The apex of aerial stem of Gynostemma pentaphyllum could drill into the ground in autumn then develop into rhizome with proliferated buds underground to survive overwintering. The formation progress and tissue structure of rhizome were observed and the phytohormone contents of IAA, GA and JA in different parts of three stages during aerial stem-to-rhizome transition were examined in this paper. The results showed that the aerial stem apex developed into swell modified stem firstly, and then drilled into ground where it developed into rhizome. The rhizome proliferated average 2.28 new axillary buds or lateral branches, which sprouted in the upcoming spring. The basic structure of aerial stem, modified stem and rhizome was the same, with the latter two stems contained abundant starch grains in the cells of starch sheath, pith and pith ray. The highest contents of IAA, GA and JA were found in aerial stem apex, the second in abnormal stem apex, and the least in rhizome. The dynamic contents of these phytohomones from the tip section, hook section, swelling section to stable section presented a trend of increasing first and then decreasing. The IAA, GA and JA content ascended at hook section and reached maximum value at swelling section in modified stem, while the IAA had the highest content at hook section in rhizome, which indicated their physiological functions at the corresponding parts.
PENG Zhen, ZHU Li, LUO Qing, GAO, Jian-you, ZHA Man-rong, PENG Xiao-lie, GUO Hui-hong, LIU Shi-biao
. Changes of Morphological Structure and Phytohormone Contents during the Aerial Stem-to-Rhizome Transition in Gynostemma pentaphyllu[J]. Subtropical Plant Science, 2021
, 50(05)
: 371
-377
.
DOI: 10.3969/j.issn.1009-7791.2021.05.007
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