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The identification and screening of germplasm resources is a basis for the work developed and improved by the excellent varieties. 55 were typical leaf lettuce (Lactuca Sativa L.) germplasm material (34 loose leaf varieties; 21 varieties of cabbage) as experimental materials, quality characteristic morphological and biological characteristics of these germplasm , stress tolerance and disease resistance of a comprehensive research and screening germplasm with excellent traits. The results are as follows: (1) there is a great difference, the coefficient of variation of the different traits of leaf lettuce, low, only 8.82%, high by 98.85% which the leaf lettuce major quantitative trait has a rich genetic diversity in Genetic variability and innovation bears great potential. Lettuce leaf traits and yield traits has a wealth of genetic information and select potential plant height, stenter, the ball leaves the number of genetic relatively stable. (2) all the heat index screening and identification of the physical and chemical indicators drawn: loose leaf heat-resistant varieties of S4, S24, S19, W9, W15, not heat-resistant varieties for S2, S6, S7, S10, S11; heat-resistant varieties of cabbage for J11, J18, J20, thermolabile J1, J2, J7; the half cabbage varieties have excellent heat resistance and marketability. (3) the growth and the growth rate in the low temperature can be used to the preliminary identification leaf lettuce germplasm hardiness. Varieties S24, J14, J15, J12, W15, W12, W9 rate under low temperature stress, adapt to cold weather conditions. S25, J16, S21, S20 growth is slow, is not suitable for cultivation under cold conditions; the cabbage lettuce varieties J6, J11, J2, J17 not only low growth rates, and the cabbage loose, J1 totally not normal cabbage; and J8, J9 , J18, J19, J20, the late growth of greater than 25g / d, is a good hardy varieties of cabbage; the half cabbage varieties showed good resistance to cold. (4) strong resistance, leaf lettuce varieties S1, S15, S22, S25, W9, W12, W16, J4, J12, J14, J15, J16; Lettuce varieties J6, J8, J11, J20 , J1, J18, W19, W1, W3, W4. (5) Test 34 loose leaf varieties tested were all taken to seeds and taken to seed and only seven varieties of head lettuce, head lettuce cabbage optimum temperature requirements are very strict, and differences between varieties. Therefore, the method and time of seed collection requirements are high, seed collection more difficult. Thus, Lettuce Seed Collection also need to continue to explore.
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