The Germination Characteristics and Dormancy Type of the Seed of Castanopsis sclerophylla

doi:10.7525/j.issn.1673-5102.2022.04.018

Abstract

Abstract:

The seed germination is an inherent property that plant adopt to environmental changes and the study of seed germination would help us to understand the population regeneration and seedling nursery. This study aimed to elucidate the type of seed dormancy and seed germination characteristics of Castanopsis sclerophylla， an important resource plant in China， the results showed that ①a very high proportion of the fruits was the seeds； ②the water absorption of the seeds was limited by the pericarp； ③seed germination was impeded by the pericarp， and seeds germinated in a wide temperature range after the pericarp removed；④the germination of seeds was difficult at15/5℃ or 20/10℃， but the germination was rapid at 25/15 ℃， 30/20 ℃ and 35/25 ℃ respectively. The results indicate that the diaspore（fruit） of C. sclerophylla had physical dormancy（PD）， Fagaceae is a new recorded family with PD and dehydration sensitivity. The results also support the hypothesis that PD is a relatively evolved trait.

Key words: recalcitrant seeds, physical dormancy, fagaceae, seed dormancy release

CLC Number:

S792.17

Xingui LE, Zhengwei WANG, Xin NING, Xiqing SUN, Yigang SONG. The Germination Characteristics and Dormancy Type of the Seed of Castanopsis sclerophylla[J]. Bulletin of Botanical Research, 2022, 42(4): 688-693.

Figures/Tables 4

Table 1

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性状 Traits	平均值±标准偏差 Mean±Standard deviation
果实长 Fruit length /mm	13.66±0.58
果实宽 Fruit width /mm	13.16±0.57
果实鲜质量 Fruit fresh weight /g	1.33±0.13
种子鲜质量 Seed fresh weight /g	1.12±0.11
果皮鲜质量 Pericarp fresh weight /g	0.21±0.02
果实干质量 Fruit dry weight /g	0.79±0.08
种子干质量 Seed dry weight /g	0.64±0.07
果皮干质量 Pericarp dry weight /g	0.15±0.02
果实含水率 Fruit moisture content /%	40.38±2.17
种子含水率 Seed moisture content /%	42.62±2.58
果皮含水率 Pericarp moisture content /%	28.51±1.83

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