Effect of gravity on apical dominance in Pharbitis nil.

Daisuke Kitazawa, Nobuharu Fujii, Hiroshi Suge, Hideyuki Takahashi

Research output: Contribution to journalArticlepeer-review

Abstract

When the upper part of main shoot of morning glory (Pharbitis nil) is gently bent down, lateral bud on the bending region is released from apical dominance and starts to elongate. But, clinorotating the bending shoots prevents the release of the lateral bud from apical dominance. These results suggest that gravity affects apical dominance in morning glory. Here we verified the gravity-regulated apical dominance by using a weeping morning glory defective in gravitropic response due to abnormal differentiation of endodermis. That is, bending main shoot of the weeping morning glory hardly caused the lateral bud to elongate. In addition, decapitation of apical bud released the lateral bud from apical dominance, and exogenous auxin applied to the cut surface of the decapitated stem was inhibitory to the outgrowth of the lateral bud in the wild type. However, the effect of auxin was much less in the weeping morning glory. Thus, apical dominance of the weeping morning glory was weaker and less influenced by gravity than that of the wild type, which could occur due to abnormal differentiation of endodermis required for graviperception.

Original languageEnglish
Pages (from-to)183-184
Number of pages2
JournalBiological sciences in space = Uchū seibutsu kagaku
Volume17
Issue number3
Publication statusPublished - 2003 Oct

ASJC Scopus subject areas

  • Medicine(all)

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