Study on the Integrative Effect of UV-B and Low Temperature on Litchi Flowering Regulatory Mechanism

doi:10.16420/j.issn.0513-353x.2026-0361

Acta Horticulturae Sinica ›› 2026, Vol. 53 ›› Issue (7): 2185-2199.doi: 10.16420/j.issn.0513-353x.2026-0361

• Cultivation · Physiology & Biochemistry • Previous Articles Next Articles

Study on the Integrative Effect of UV-B and Low Temperature on Litchi Flowering Regulatory Mechanism

LIU Jingjing¹, XIE Haoyang¹, HUANG Xiao¹, HU Zhengxiao¹, ZENG Wanqi¹, ZHANG Huiyun², LUO Xinping², SHEN Jiyuan¹^,^*()

¹ College of Horticulture， South China Agricultural University， Guangzhou 510642， China
² Institute of Tropical and Subtropical Cash Crops， Yunnan Academy of Agricultural Sciences，Baoshan， Yunnan 678000， China

Received:2026-04-21 Revised:2026-07-03 Online:2026-07-23 Published:2026-07-23
Contact: SHEN Jiyuan

Abstract

Abstract:

Litchi flowering requires sufficient low-temperature induction，but the “warm winters” that frequently occur in southern China often lead to inadequate flowering in litchi. In this study，five-year-old air layered potted‘Feizixiao’litchi plants were placed in a climate chamber at 15 ℃，and two intensities of UV-B radiation（1.75 and 3.75 kJ · m^-2· d^-1，respectively）were applied to investigate the integrative effects of UV-B radiation and low temperature on the growth，development，antioxidant capacity，and flowering of litchi. The results showed that the combination of high-intensity UV-B radiation （3.75 kJ · m^-2· d^-1） and low temperature increased the flowering plant rate and the pure panicle rate in comparison to the control. The combination of UV-B radiation and low temperature enhanced the accumulation of H₂O₂，but significantly reduced the total phenolic content and SOD activity in leaves. The accumulation of sucrose and glucose in leaves was induced by short-term low temperature，but decreased in the late stage of low temperature indcution. Low temperature induced the expression of LcUVR8-1，LcUVR8-2，LcCOP1，LcCO1，LcCO2，LcFT1，and LcFT2；the combination of high-intensity UV-B radiation and low temperature induced the expression of LcFT1 but inhibited the expression of LcFT2. These findings indicate that the accumulation of H₂O₂ by high-intensity UV-B radiation treatment resulting in an up-regulation of LcFT1，may enhance the flowering ability of litchi in the presence of low temperature.

Key words: litchi, UV-B, low temperature, flowering, antioxidant responses, soluble sugars

LIU Jingjing, XIE Haoyang, HUANG Xiao, HU Zhengxiao, ZENG Wanqi, ZHANG Huiyun, LUO Xinping, SHEN Jiyuan. Study on the Integrative Effect of UV-B and Low Temperature on Litchi Flowering Regulatory Mechanism[J]. Acta Horticulturae Sinica, 2026, 53(7): 2185-2199.

Figures/Tables 13

References 51

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基因Gene	正向引物序列（5′-3′）Forward primer sequence	反向引物序列（5′-3′）Reverse primer sequence
LcUVR8-1	CCTTCCATTTTGGACTCTTCTG	GAGCTTCCAGCACCAGTGTAT
LcUVR8-2	CCTCTCTCACGCTCATTCAAC	GATGGGTAAACTGAGTCACTGG
LcCOP1	ATGGAGGTGGCGGAGGTGGAGC	CGTACTTGCGGCTTGAGTCTA
LcCO1	ATGAAAGAAGAGAGCAGCGAC	GGCATTGTTCCTTCATTCTAA

基因Gene	正向引物序列（5′-3′）Forward primer sequence	反向引物序列（5′-3′）Reverse primer sequence
LcUVR8-1	CCTTCCATTTTGGACTCTTCTG	GAGCTTCCAGCACCAGTGTAT
LcUVR8-2	CCTCTCTCACGCTCATTCAAC	GATGGGTAAACTGAGTCACTGG
LcCOP1	ATGGAGGTGGCGGAGGTGGAGC	CGTACTTGCGGCTTGAGTCTA
LcCO1	ATGAAAGAAGAGAGCAGCGAC	GGCATTGTTCCTTCATTCTAA

基因Gene	正向引物序列（5′-3′）Forward primer sequence	反向引物序列（5′-3′）Reverse primer sequence
LcUVR8-1	GGGGGTGATGTAAGTGTACCA	GAGCTTCCAGCACCAGTGTAT
LcUVR8-2	CTTGTGGGGGACGTCATACT	GATGGGTAAACTGAGTCACTGG
LcCOP1	CACCAGACATGGATGATACCG	CGTACTTGCGGCTTGAGTCTA
LcCO1	GACCAGACCACGAATCAAGG	ATCACAGACGCCGGATATG
LcCO2	CTCAATACGGGGTCGTTCC	AGCCGACAGATTTCGCAGGAG
LcFT1	GCCGCGGTCTACTTTAATAGC	GCATGTCAAAGCTAGCAAAGA
LcFT2	CTTCAACTGCCAGAGGGAGA	GCATGTCAAAGCTAGCAAAGA
LcActin	ACCGTATGAGCAAGGAAATCACTG	TCGTCGTACTCACCCTTTGAAATC

基因Gene	正向引物序列（5′-3′）Forward primer sequence	反向引物序列（5′-3′）Reverse primer sequence
LcUVR8-1	GGGGGTGATGTAAGTGTACCA	GAGCTTCCAGCACCAGTGTAT
LcUVR8-2	CTTGTGGGGGACGTCATACT	GATGGGTAAACTGAGTCACTGG
LcCOP1	CACCAGACATGGATGATACCG	CGTACTTGCGGCTTGAGTCTA
LcCO1	GACCAGACCACGAATCAAGG	ATCACAGACGCCGGATATG
LcCO2	CTCAATACGGGGTCGTTCC	AGCCGACAGATTTCGCAGGAG
LcFT1	GCCGCGGTCTACTTTAATAGC	GCATGTCAAAGCTAGCAAAGA
LcFT2	CTTCAACTGCCAGAGGGAGA	GCATGTCAAAGCTAGCAAAGA
LcActin	ACCGTATGAGCAAGGAAATCACTG	TCGTCGTACTCACCCTTTGAAATC

处理 Treatment	成花株率/% Percentage of flowering plants	成花枝率/% Percentage of flowering branches	纯花穗比例/% Percentage of pure flower spikes	花穗长/cm Inflorescence length	花穗宽/cm Inflorescence width	白点时间/d Days to white spot stage	雌花开放时间/d Days to female flower anthesis	雄花开放时间/d Days to male flower anthesis
CK	50	78.02 ± 6.59 a	42.73 ± 2.73 b	14.23 ± 0.79 a	8.80 ± 0.96 a	7.00 ± 2.00 a	27.00 ± 1.00 a	33.50 ± 0.50 ab
T1	75	66.67 ± 23.13 a	9.52 ± 9.52 c	12.33 ± 1.48 a	6.92 ± 1.14 a	7.00 ± 0.00 a	27.50 ± 2.50 a	32.00 ± 0.00 b
T2	75	93.67 ± 3.19 a	93.33 ± 6.67 a	13.03 ± 0.51 a	8.71 ± 0.45 a	6.25 ± 0.85 a	33.33 ± 4.84 a	35.67 ± 0.67 a

Study on the Integrative Effect of UV-B and Low Temperature on Litchi Flowering Regulatory Mechanism

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处理Treatment	0 d	3 d	7 d	21 d	35 d	35 + 7 d
CK	49.75 ± 1.57 a	50.85 ± 1.65 a	50.00 ± 1.29 a	50.58 ± 1.71 a	50.50 ± 1.89 a	50.63 ± 2.02 a
T1	48.20 ± 1.37 a	47.45 ± 1.24 ab	48.60 ± 1.32 a	46.68 ± 1.36 ab	46.65 ± 1.56 a	49.23 ± 1.35 a
T2	45.98 ± 0.26 a	44.93 ± 0.78 b	43.60 ± 1.72 b	45.28 ± 0.56 b	46.60 ± 0.56 a	46.80 ± 0.72 a

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