Studies on the Karyotype and Its Aberration of Nomocharis forrestii (Liliaceae)

Abstract

Abstract:

Nomocharis forrestii Balf. f. from Zhongdian, Yunnan, was cytologically investi-

gated in this wrok. There were two cytotypes in N. forrestii populations. The reference

karyotype of A cytotype was 2n=24=2m (2SAT) +2sm+8st (4SAT) +12t (2SAT). In

this cytotype, there was no satellite in the long arms of the 3rd pair, which was homozy-

gous. The reference karyotype of B cytotype was 2n=24 = 2m (2SAT) + 2sm+8st

(2SAT) +12t (3SAT). In B cytotype, there was an obvious satellite in the long arm of one

chromosome in the 3rd pair, but no satellite in the long arm of the other. This was heterozy-

gous. The ratio between the cytotypes was approximately lA: 2B in the population. The

karyotype in N. forrestii was similar to that in the genus Lilium, 2n=24, particularly the

chromosomal morphology of m-chromosomes or sm-chromosomes. However, the secondary

constrictions of the m-chromosomes was more obvious and greater in N. forrestii.

Numerous aberrant karyotypes in N. forrestii were found in the somatic cells. The

structural aberrations include breakage, inversion (incl. pericentric inversion), translocation

(incl. Robertsonian translocation), deletion, somatic orossing over between the homologous

chromosomes, etc. In the aberrant karyotype (1), an obvious deletion took place in one

chromosome or unequal translocation took place in one chromosome of the 1st pair, and a

fragment was added to the long arm of one chromosome as a result of translocation in the

7th pair. A dicentric chromosome was found between two chromosomes from 8th and the

12th pair, which resulted in 2n=23. In aberrant karyotype (2), translocation or deletion

took place in the 5th, 6th, 7th and 10th pair. There were 4 B-chromosomes in the aberrant

cell. In the aberrant karyotype (3), the long arm of one chromosome was found to have a

deletion in the 6th pair. A dicentric chromosome was generated between two chromosomes

from the 9th and the 10th pair, which results in 2n=23. There was one B-chromosome in

the aberrant cell. In the aberrant karyotype (4), a pericentric inversion took place in the 1st

pair, and an unequal translocation occured between the 1st and the 6th pair, which changed

the first pair from m-chromosomes into st-chromosomes. The long arm of one chromosome

carried a remarkable deletion in the 8th pair. In the aberrant karyotype (5), a Robertsonian

translocation took place between two chromosomes from the 6th and 7th pair, and a frag-

ment was added to the long arm of one chromosome as a result of the translocation in the

l2th pair. In the aberrant karyotype (6), breakage occured near or at the centromere of one

chromosome of the 1st and the 6th pair, which resulted in 2n= 26. Before the breakage, the

unequal crossing over had taken place between the homologous chromosomes in the 1st and

6th pair, and an unequal translocation was found between two chromosomes from the 1st

and 6th pair. Accoding to statistics of aberrant cells, the chromosomal aberration took place

mainly in the 1st, 6th, 7th, 8th, 9th and 10th chromosomes, with rates of aberration 33-

37%. It is these chromosomes that often show polymorphism.

From above, the karyotype of N. forrestii, is under strong differentation. So the somat-

ic chromosome aberration with a high frequency is one of important factors in the intraspe-

cific differentiation in N. forrestii.

Key words: Nomocharis forestii, karyotype, structural aberration, evolution

Yu Hong, Huang Rui-fu. Studies on the Karyotype and Its Aberration of Nomocharis forrestii (Liliaceae)[J]. .

[1]	DENG Liangkai, HUANG Yong, SHI Yaling, WAN Dan, LI Lin. Network structure characteristics and spatial pattern evolution of educational facilities in mountainous towns：a case study of Wanzhou District of Chongqing [J]. , 2020, 37(5): 629-639.
[2]	XU Lifan, WANG Xiong. A conformal focusing microwave hyperthermia system based on differential algorithm [J]. , 2020, 37(5): 708-713.
[3]	LI Weilin, CHENG Huihong, ZHANG Huai, SHI Yaolin. Three-dimensional numerical modeling of the tectonic evolution of the serial basins in the Hexi Corridor in Northwest China [J]. , 2019, 36(2): 196-207.
[4]	LIU Jianming, ZHANG Yuxiu, ZENG Lu, JU Yiwen, RUI Xiaoping, QIAO Xiaojuan. Structure-controlled karst development in Middle-Upper Proterozoic strata in the Zhangfang area in Beijing [J]. , 2019, 36(2): 208-217.
[5]	LIU Hongyan, CHEN Wen. Evolution of size distribution of primary schools in Nanjing City from the perspective of school system [J]. , 2019, 36(1): 64-71.
[6]	REN Jiamin, MA Yanji. Spatial-temporal evolution characteristics of decoupling relationship between industrial growth and industrial atmospheric pollution in Jilin Province [J]. , 2019, 36(1): 72-81.
[7]	TIAN Xiuqin, GAO Jinlong, CHEN Wen, CHEN Jianglong. Evolution of rural land in developed areas within the context of population shrinkage: evidence from Changshu City of Jiangsu Province [J]. , 2018, 35(5): 645-653.
[8]	CHENG Lanhua, YANG Degang. Spatio-temporal evolution characteristics of health resources mismatch in Urumqi-Changji region [J]. , 2018, 35(3): 382-390.
[9]	TU Tangqi, CHEN Jianglong, WEI Yehua Dennis, LIANG Qichun, ZHANG Yinghao. Spatial structure and evolution of basic education facilities in Nanjing in China [J]. , 2018, 35(1): 66-74.
[10]	ZHAO Yannan, YANG Degang, ZHANG Xinhuan, XIONG Chuanhe, CHEN Dongli. Temporal and spatial evolution of top grade hotel industry and its influencing factors in central district of Urumqi [J]. , 2017, 34(1): 77-85.
[11]	ZOU Hui, DUAN Xuejun, ZHAO Haixia, WANG Lei. Spatial evolution of pollution-intensive industries and its effects on pollution emissions in Yangtze River Delta [J]. , 2016, 33(5): 703-710.
[12]	YING Chenglong, LEI Jun, DUAN Zuliang, ZHANG Lu . National living pattern and its evolution in Urumqi from 1982 to 2010 [J]. , 2016, 33(3): 387-397.
[13]	TANG Hong, CHEN Dabo. Development features and temporal-spatial evolution of economy in Central Asia in the past 20 years [J]. , 2015, 32(2): 214-220.
[14]	ZHAO Hongbo, MA Yanji. Spatial-temporal evolution and driving mechanisms of regional economic disparities of old industrial base in Northeast China：a case study of the central Jilin province [J]. , 2014, 31(2): 187-197.
[15]	TENG Fei, LIU Yi, GUO Teng-Yun, DONG Guan-Peng. Regional competitive industries in Beijng and their evolution based on sky-line diagram of input-output technique [J]. , 2012, 29(5): 614-620.

Studies on the Karyotype and Its Aberration of Nomocharis forrestii (Liliaceae)

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 15

Recommended Articles

Metrics

Comments