刀状黑黄檀种子萌发与苗期生长特性种源/家系变异分析评价

Provenance/family variation analysis on seed germination and seedling growth traits in Dalbergia cultrata

  • 摘要: 【目的】 分析评价刀状黑黄檀种子萌发与苗期生长特性的种源/家系变异特征,筛选萌发能力强、早期生长快速的优良种源/家系,为优良家系精准评价与筛选提供参考依据及基础材料。【方法】 以采集于云南省的9个种源40个家系刀状黑黄檀种子为材料,分析评价不同种源/家系刀状黑黄檀种子萌发和幼苗生长性状的变异特征,利用主成分分析对种源/家系进行综合评价及初步筛选。【结果】不同种源的种子萌发与幼苗生长特性比较结果显示,除江城(JC)种源外,其他种源的萌发率均显著高于整董(ZD)种源(P<0.05,下同),其中勐满(MM)种源的萌发率最高;勐旺(MW)种源的萌发势为84.00%,显著高于大渡岗(DD)、JC、龙潭(LT)、麻栎坝(MLB)和ZD种源;MW种源的种子萌发指数为67.49,显著高于其他种源;LT种源的苗高和地径均高于其他种源。不同家系的种子萌发与幼苗生长特性比较结果显示,易武(YW)种源的YW1家系萌发率最高(97.33%),萌发率变异系数介于0.64%~27.51%;景洪(JH)种源的JH8家系萌发势最高(95.33%),萌发势变异系数介于2.78%~78.06%;MW种源的MW2家系萌发指数最高(77.92),萌发指数变异系数介于1.69%~33.68%;LT种源的LT3家系苗高最高(34.73 cm),苗高变异系数介于0.04%~42.77%;LT3家系的地径最大(3.69 mm);地径变异系数介于0.30%~24.71%。主成分分析结果显示,MW2、JH8和MW8等22个家系的综合得分高于参试家系均值,入选为优良家系。【结论】刀状黑黄檀具有丰富的表型多样性,其中景洪、勐旺等种源具有较强的种子萌发能力,龙潭、大渡岗等种源早期生长较快;基于种子萌发与幼苗生长性状分析筛选出22个优良家系。

     

    Abstract: 【Objective】 To analyze and evaluate the provenance/family variation characteristics of seed germination and seedling growth traits in Dalbergia cultrata, and to screen superior provenances and families with strong germination ability and rapid early growth, which could provide reference basis and basic materials for the accurate evaluation and selection of elite families. 【Method】 Seeds of Dalbergia cultrata from 9 provenances and 40 families collected in Yunnan were used as materials. The variation characteristics of seed germination and seedling growth traits among different pro-venances and families were analyzed and evaluated. Principal component analysis was employed to evaluate and preliminarily screen the provenances and families. 【Result】 The comparative analysis of seed germination and seedling growth characteristics among different provenances revealed that, with the exception of Jiangcheng (JC) provenance, the germination rates of all other provenances were significantly higher than that of Zhengdong (ZD) provenance (P<0.05, the same below), with Mengman (MM) provenance exhibiting the highest germination rate. The germination vigor of Mengwang (MW) provenance was 84.00%, which was significantly higher than that of Dadugang (DD), JC, Longtan (LT), Maliba (MLB), and ZD provenances. The germination index of MW provenance was 67.49, which was significantly higher than that of all other provenances. The LT provenance displayed the highest seedling height and basal diameter among all provenances. The comparison of seed germination and seedling growth traits among different families indicated that YW1 family in Yiwu (YW) provenance had the highest germination rate (97.33%), with the coefficient of variation (CV) for germination rate ranging from 0.64% to 27.51%. Family JH8 in Jinghong (JH) provenance exhibited the highest germination vigor (95.33%), with CV values for germination vigor varying between 2.78% and 78.06%. Family MW2 in MW provenance achieved the highest germination index (77.92), with CV for germination index ranging from 1.69% to 33.68%. Family LT3 in LT provenance showed the greatest seedling height (34.73 cm), with CV values for seedling height ranging from 0.04% to 42.77%, and also had the maximum basal diameter (3.69 mm), with CV for basal diameter ranging from 0.30% to 24.71%. Principal component analysis revealed that 22 families, such as MW2, JH8, and MW8, had comprehensive scores above the mean value of all tested families, and were thus selected as elite families. 【Conclusion】 Dalbergia cultrata possesses abundant phenotypic diversity. Jinghong and Mengwang provenances demonstrate strong seed germination capacity, while Longtan and Dadugang provenances show relatively rapid early growth. Based on the analysis of seed germination and seedling growth traits, 22 elite families were selected.

     

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