THE EFFECT OF HORMONES ON FEMALE FLOWER DIFFERENTIATION IN WAX

Houcheng Liu, Shiwei Song, Riyuan Chen, Guangwen Sun
The effects of hormones on female flower differentiation in 4 wax gourd, Benincasa hispida Cogn var. chiehqua How., cultivars (lines) were studied, by sampling stem tips at 2 development stages (1st stage: plant with 10 expanded leaves, on which flower sex differentiation occurred at the 14-20th nodes; 2nd stage: plant with 19 expanded leaves, on which flower sex differentiation occurred at the 23-35th nodes). The results showed that the differentiation proportion of female flowers (DPFF) in the cultivars 14-2, ‘Yueke No.2’, ‘Texuan No.4’ and ‘Huangmao’ decreased in succession at both stages. The contents of indole acetic acid (IAA), gibberellic acid (GA3), zeatin (ZT) and abscisic acid (ABA) in the stem tips of the 4 cultivars (lines) were different at the 2 stages. There was a significant negative correlation between ZT contents in stem tips and DPFF at the 1st stage (r=-0.676) (P=0.05), but little correlation at the 2nd stage. There was a significant positive correlation between ABA content in stem tips and DPFF at the 1st stage (r=0.950) (P=0.01), but a negative correlation at the 2nd stage (r=-0.253). The correlation coefficient of GA3 concentration and DPFF was 0.492 and 0.949 (P=0.01) at the 1st stage and 2nd stages respectively, which indicated that higher GA3 content in stem tips was propitious to female flower differentiation. The correlation coefficient of IAA concentration and DPFF was 0.732 and 0.925 (P=0.01) at the 1st stage and 2nd stages respectively, whilst those of GA3/ZT and DPFF were 0.819 and 0.984 (P=0.01) and those of ZT/IAA and DPFF were -0.860 and -0.838 (P=0.01). However, the correlation coefficient of GA3/ABA and DPFF was 0.111 and 0.782 (P=0.01) at the 1st stage and 2nd stages respectively. These indicated that IAA contents ZT/IAA, GA3/ZT in stem tips might be used to prognosticate female flower differentiation in wax gourd.
Houcheng Liu, , Shiwei Song, , Riyuan Chen, and Guangwen Sun, (2008). THE EFFECT OF HORMONES ON FEMALE FLOWER DIFFERENTIATION IN WAX . Acta Hortic. 774, 307-313
DOI: 10.17660/ActaHortic.2008.774.42
https://doi.org/10.17660/ActaHortic.2008.774.42
wax gourd, female flower differentiation, indole acetic acid, gibberellin, zeatin, abscisic acid
English

Acta Horticulturae