IAPT/IOPB chromosome data 12

IAPT chromosome data 33

“…The present chromosome count of n = 7, is in agreement with the diploid counts with a basic number of x = 7, as recorded in the individuals growing in the regions of Jammu & Kashmir (Mehra & Sunder, 1969;Mehra & Remanandan, 1973;Mehra & Sharma, 1977a;Koul & Gohil, 1987, 1990, Himachal Pradesh (Kaur & al., 2011;Singhal & al., 2014;Singh & al., 2019), Meghalaya (Mehra, 1982) and West Bengal (Mehra & Sharma, 1977b) States of India. Due to its gregarious nature of occurrence over the native and introduced areas, species have been extensively explored for the chromosome number diversity from different regions of the globe, and a series of cytotypes harbouring individuals with aneuploid and euploid counts was recorded: 2n = 14 þ 0- 4B, 26, 27, 28 þ 0-4B, 29, 30, 35, 40, 41, 42 (Rice & al., 2015;Goldblatt & Johnson, 1979þ).…”

Heterochromatin patterns in four diploid Zephyranthes species with different basic chromosome number (Amaryllidaceae)

“…Currently, few available meiotic behavior analyses, of Zephyranthes species are available (Daviña, 2001;Gianini Aquino et al, 2020, and references therein) and in consequence, the origin of polyploids remain unsolved. In line with this, meiosis has been studied only in few species to corroborate the proposed basic numbers, x = 5, 6 and 7 (Daviña & Fernández, 1989;Daviña, 2001;Daviña et al, 2020;Gianini Aquino et al, 2020).…”

“…Habranthus, and was confirmed in diploid and polyploid species, mainly tetraploids (Daviña 2001;Gianini Aquino et al 2020;Gianini Aquino, 2023). The basic x = 7 chromosome number was found in the following diploid South American endemic species, Z. flavissima, Z. jamesonii, and Z. pedunculosa (Daviña et al, 2020).…”

“…Currently, Zephyranthes also includes species formerly treated under Habranthus Herb., Sprekelia Heist., Haylockia Herb., Pyrolirion Herb., and Rhodophiala C. Presl (García et al, 2019). Cytologically, it presents several basic chromosome numbers, mainly x = 5, 6, 7, and 9, but most of the species studied have either the basic chromosome number x = 6 or a multiple of it (Daviña, 2001;Daviña & Honfi, 2018;Daviña et al, 2020). In genera with two or more basic chromosome numbers, the identification of the evolutionary trend to descending or ascending dysploidy is confirmed by karyomorphological information and C-Het pattern distribution (Guerra, 2000a(Guerra, , 2000b2008;Cordeiro et al, 2020), mainly because dysploidy trends can be elucidated by comparing basic karyotypes.…”

“…On the other hand, diploids based on x = 7 have been found only three times, in Z. jamesonii (Baker) Nic. García & S.C. Arroyo (Naranjo, 1974;Di Fulvio, 1986), in Z. flavissima Ravenna (Daviña, 2001;Daviña et al, 2020) and Z. pedunculosa (Herb.) Nic.…”