Light Supplementation in Pitaya Orchards Induces Pitaya Flowering in Winter by Promoting Phytohormone Biosynthesis

Author:

Wang Meng12,Li Jiaxue12,Li Tao12,Kang Shaoling12,Jiang Senrong12,Huang Jiaquan12,Tang Hua12

Affiliation:

1. Sanya Institute of Breeding and Multiplication, Hainan University, Sanya 572025, China

2. School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China

Abstract

The interaction between light and phytohormones is crucial for plant growth and development. The practice of supplementing light at night during winter to promote pitaya flowering and thereby enhance yield has been shown to be crucial and widely used. However, it remains unclear how supplemental winter light regulates phytohormone levels to promote flowering in pitaya. In this study, through analyzing the transcriptome data of pitaya at four different stages (NL, L0, L1, L2), we observed that differentially expressed genes (DEGs) were mainly enriched in the phytohormone biosynthesis pathway. We further analyzed the data and found that cytokinin (CK) content first increased at the L0 stage and then decreased at the L1 and L2 stages after supplemental light treatment compared to the control (NL). Gibberellin (GA), auxin (IAA), salicylic acid (SA), and jasmonic acid (JA) content increased during the formation of flower buds (L1, L2 stages). In addition, the levels of GA, ethylene (ETH), IAA, and abscisic acid (ABA) increased in flower buds after one week of development (L2f). Our results suggest that winter nighttime supplemental light can interact with endogenous hormone signaling in pitaya, particularly CK, to regulate flower bud formation. These results contribute to a better understanding of the mechanism of phytohormone interactions during the induction of flowering in pitaya under supplemental light in winter.

Funder

Hainan Provincial Natural Science Foundation high-level Talents Project

Hainan Major Science and Technology project

Natural Science Fund of Hainan Province

Hainan Province Science and Technology Special Fund

the earmarked fund for “Tropical High-efficiency Agricultural Industry Technology System of Hainan University”

Publisher

MDPI AG

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