21份猫尾草种质形态、光合及荧光特性综合评价
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中图分类号：S543.9 文献标识码：A 文章编号：1007-0435（2025）09-2796-12
Comprehensive Evaluation of Morphology， Photosynthetic and Fluorescence Characteristics of 21 Germplasm Resources of Timothy
FU Jun-shi 1，2 ，NANLi- ⋅li⋅1，2* ， ZHANG Ze-long1，²，WU Shi-wen1，²，REN Meng-yu 1，2 CHEN N a1，2 ， JIAO Long-guang1.2
（1.Pratacultural Collge，GansuAgriculturalUniversity;KeyLaboratoryofGrassand Ecosystem，MinistryofEducations，Lanzhou，GansuProvince730o7o，China;2.KeyLaboratoryofForageGermplasm InnovationandNew VarietyBreedingof Ministry of Agriculture and Rural Affairs，Lanzhou，Gansu Province 73oo7O，China）
Abstract： In order to explore high photosynthetic eficiency timothy（Phleum pratense）germplasm resources， this study investigated the differences in morphological indicators，chlorophyllcontent，photosynthesis，and chlorophyl fluorescence parameters of 21 timothy germplasm materials in the second and third years of growth. The results showed that compared with the second year of growth，except for a few materials，the plant height， leaf area，chlorophylla content，chloroplast pigmentcontent，transpiration rate，net photosynthetic rate，inter celular carbon dioxide concentration，PSII potential photochemical eficiency，and apparent electron transfer eficiency of the tested timothy showed an increasing trend，while stomatal limitation value and water use efficiency showed a decreasing trend in the third year.Seven comprehensive factors were extracted from 2O indexes by principal component analysis，and the cumulative contribution rate was 84.526% . Taking the comprehensive score as the dependent variable and 2O indexes as the independent variables，8 key indexes for evaluating the germplasm of timothy were screened by stepwise regression analysis. The 21 germplasm samples of timo thy can be clustered into threecategories，among which materials of 9657，9451，10676，and 4190 belong to thefirst group with high comprehensive evaluation values，and can be used as excelent parental materials for the breeding and improvement of high photosynthetic eficiency new varieties of timothy. Key words： Timothy; Morphological characteristics;Photosynthetic characteristics; Chlorophyll fluorescence; High photosynthetic efficiency breeding
猫尾草（Phleumpratense）又名梯牧草、提摩草等，为禾本科多年生草本植物，生活年限一般为 6～ 7年，第2～5年为产草高峰期，在云、贵、川以及甘肃等高海拔地区、青藏高原西南部均有较好的适应性，并在我国东北、华北和西北等地区广泛分布，因其适应冷凉潮湿的环境而著名[1-3]。（剩余15512字）
