玉簪属品种DUS测试中数量性状的测定方法探索

利用74份玉簪品种对19个数量性状进行筛选和分级研究,并对不同性状的测量时期和部位进行了探讨。结果表明:叶柄宽度的测试方式采取自然状态下直接测量,花序梗长度测量从基部到第1花苞片着生处的长度,苞片性状全部观测第1花苞片,花相关性状以1~3花中的完全开放花为观测对象;所有候选性状均符合DUS测试指南性状选用的条件,可分为3~9个连续的分级;植株、叶片的观测可改在开花期观测,花序相关性状则在末花期观测。

Measurement Method For the Quantitative Traits Used in DUS Testing of Hosta(Hosta Tratt.)

In order to optimize the DUS testing in hosta(Hosta Tratt.),we investigated 19 quantitative traits in 74 varieties.The quantification period and tissue position for some quantitative characters were analyzed.Results showed that the width of petiole could be measured in its natural state,and the length of peduncle could be quantified from the base to the attach of first flower.The bracts of first flower were suitable as observation object for all characters of bract,and the 1 st-3 nd opening flower was optimal for quantitative traits about flower.All the candidate characters fulfilled the requirements of DUS testing and could be classified into 3 to 9 continuous grades.The quantitative characters of plants and leaves could be measured at blossom,and the characters of inflorescence should be observed after the last flower opened.