Comparative chromosomal features for four Apocynaceae species from Northeastern Thailand

• Published in: Biológia Vol. 76; no. 9; pp. 2485 - 2490
• Main Authors: Saensouk, Surapon, Saensouk, Piyaporn
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.09.2021; Springer Nature B.V
• Subjects: Apocynaceae; Biomedical and Life Sciences; Cell Biology; Chromosome number; Chromosomes; Horses; Karyotypes; Life Sciences; Microbiology; Original Article; Plant Sciences; Species; Zoology; Thailand; Thailand; Chromosome; Karyotype
• ISSN: 0006-3088; 1336-9563
• DOI: 10.1007/s11756-021-00783-0

The comparative chromosomal features of four species belonging to family Apocynaceae from Northeastern Thailand were studied from the root tips. The somatic chromosome numbers of all specimens were found to be 2 n  = 36 for Allamanda blanchetii , 2 n  = 18 for A. cathartica , 2 n  = 20 in A. schottii and 2 n  = 52 in Cryptostegia grandiflora . The chromosome numbers of A. blanchetii , A. cathartica have the same chromosome number from previous studied except chromosome number of C. grandiflora differs from previously reported. Moreover, the chromosome number of C. grandiflora has never been studied previously. The karyotype formulas are presented as 12 m + 4sm + 2st in A. cathartica and 10 m + 8sm + 2st in A. schottii . The karyotype formulas of both strains differ from those previously reported. Therefore, the karyotypes of two species, A. cathartica and A. schottii , have been found different and it can be used for classification. This study including chromosome number and karyotype of four species ( Apocynaceae ) is the first reported in Thailand.