Flowering Biological Characteristics and Breeding System of Lumnitzera racemosa

doi:10.7525/j.issn.1673-5102.2024.01.017

Abstract

Abstract:

In order to reveal the endangered mechanism and carry out related conservation actions of Lumnitzera racemosa， we observed the flowering dynamics of the introduced L. racemosa in Dangan Island Provincial Nature Reserve， Zhuhai， Guangdong， and investigated the breeding system of L. racemosa by using the out-crossing index（OCI）， pollen-ovule ratio（P/O）， pollen viability and stigma receptivity， and artificial pollination. The results showed that：（1）The flowering period of L. racemosa population started May 16， the full blooming period was from May 25 to July 1， and the last flowering period was from July 5 to August 31， and the flowering period of L. racemosa population was up to 106 days. The flowering duration of inflorescence was 5-18 days， and average duration was （10.80±3.58） days； The single flowering period of L. racemose lasted 7-13 days， with an average of （9.1±1.3） days. （2）Pollen viability was highest on the day of flowering， reaching 58.73%， and decreased on the second day and no longer viable was on the third day； Stigma receptivity was weakest at the first day of opening， then gradually strengthened， and was strongest at 100% at the third day， and maturity time of male and female was inconsistent. （3）OCI was 4， the breeding system of L. racemosa was mainly outcrossing with partial self-compatible， which required pollinator； P/O was 5 740.50±1 318.20， the breeding system was obligate xenogamy； pollination test showed that the breeding system was a mixed mating system with both self and xenogamy. Based on the above， the breeding system of L. racemosa was mainly outcrossing with partial self-compatibility and requiredr pollinators.

Key words: Lumnitzera racemose, flowering biological characteristics, pollen viability, stigma receptivity, breeding system

CLC Number:

Q945.6+4

Yanqing CAI, Yujun CHEN, Mei LI, Chuangfa DENG, Liejian HUANG. Flowering Biological Characteristics and Breeding System of Lumnitzera racemosa[J]. Bulletin of Botanical Research, 2024, 44(1): 152-160.

Figures/Tables 8

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花部器官 Floral parts	样本数量 Number of samples	范围 Range	平均值±标准差 Mean±SD
花序长 Length of inflorescence/mm	30	34.18~70.34	53.18±9.42
花数目/花序 Number of flowers per inflorescence/mm	60	2.00~12.00	6.40±2.02
花总长 Length of flower/mm	30	12.95~17.86	15.37±0.94
花丝长度 Length of filament /mm	30	3.93~7.72	5.74±0.44
雄蕊数目/花 Number of stamens per flower	132	8.00~17.00	10.00±0.80
花柱长度 Length of pistil/mm	30	6.11~8.73	7.50±0.69
子房长度 Length of ovary /mm	30	4.84~7.53	5.92±0.58
胚珠数目/子房 Number of ovules per ovary	30	3~5	4.00±0.68
花冠直径 Corolla diameter/mm	132	9.25~16.63	13.82±1.33
花瓣长 Length of peta/mm	90	4.49~7.80	6.66±0.63
花瓣宽 Breadth of petal/mm	90	1.91~3.32	2.64±0.24
花瓣数目/花 Number of petals	132	4~8	5.0±0.3

处理 Treatments	结实率 Set/%	败育率 Abortion rate/%
自然授粉（对照组） Natural control（CK）	91.67±2.89a	35.00±10.90d
人工自花授粉 Manual self-pollination	78.33±10.41b	85.83±3.82b
人工同株异花授粉 Manual geitongamy	72.50±2.50b	46.67±5.20d
人工异株异花授粉 Manual cross pollination	76.67±3.82b	64.17±8.78c
无融合生殖 Apomixis	95.00±5.00a	100.00±0.00a

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