A karyotype analysis of Lactuca (Asteraceae) in Korea
2009
Yang, J.Y. (Kyungpook National University, Daegu, Republic of Korea) | Choi, K. (Korea National Arboretum, Pocheon, Republic of Korea) | Pak, J.H. (Kyungpook National University, Daegu, Republic of Korea), E-mail: [email protected]
The chromosome morphology of two Korean Lactuca (L. indica, L. triangulata) is reported herein. The chromosome number and karyotype of a naturalized plant, L. scariola are reported for the first time. The basic chromosome number was x=9. Polyploid forms were not recorded. The karyotypes of L. indica, L. scariola, and L. triangulata were 2 n = 18 = 2 m + 7 sm, 2 n = 18 = 1 m + 6 sm + 2 st, 2 n = 18 = 2 m + 5 sm + 2 st, respectively. Both L. indica and L. triangulata had satellites at the ends of their shout arms. The haploid genome lengths of L. indica, L. scariola, and L. triangulata were 56.3 ㎛, 35.3 ㎛, and 72.5 ㎛ respectively. Each chromosome length of naturalized L. scariola was 2.7-5.2 ㎛; the smallest among Korean Lactuca. The chromosome lengths of L. indica and L. triangulata were 4.7-7.6 ㎛ and 2.9-7.9 ㎛, respectively. The karyotype of L. scariola differed from that of L. indica and L. triangulata both of which belong to sect. Tuberosae. Therefore, L. scariola is thought to belong to sect. Lactuca subsect. Lactuca.
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