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First Detection Of Cytomixis and its consequences in Thalictrum cultratum Wall. (Ranunculaceae)

Puneet Kumar, Singhal V.K., Srivastava S.K.

In current paper, we studied the meiotic chromosome number and details of cytomixis recorded for the first time in Thalictrum cultratum Wall. from the high altitude areas of northwest Himalaya (India). Cytomixis, the phenomenon of inter PMC (pollen mother cell) migration of chromatin material has been reported in many angiosperms and other groups of plants, but there is no published report in Thalictrum cultratum. All the presently studied accessions of the species existed at diploid level (x = 7). The present chromosome count of n = 14 has been reported for the
first time from the study area. The cytological stability of any plant is an important consideration in view of its existence in nature. Meiotic disturbances can impose threat to the reproductive potential of plant. Current study reveals the occurrence of inter PMC migration of chromatin material. In present investigation, the phe­nomenon of cytomixis can be observed between 2 to 9 PMCs. Chromatin migration occurs through narrow and broad cytoplasmic channels or occasionally fused together during metaphase­I and anaphase­I. Cytomixis resulted in the formation of hypo­ (n = 2, 2 + 1 small fragment, n = 3 + 3 small fragments, 4, 5 + extra mass of chromatin, 13) and hyperploid (n = 7 + 2 small fragments, 8 + 2 small fragments, 14, 14 + 2 small fragments, 15) PMCs, variable sized pollen grains and pollen sterility (20 %). The current study reveals that cytomixis is responsible for formation of PMCs with variable chromosomes (hypo­ and hyperploid) and pollen grains of heterogeneous sizes and pollen sterility in T. cultratum. This is the first report of cytomixis in the species.

Key words: chromatin migration, chromosomes, hypo­ and hyperploid PMCs, meiosis, pollen grains

Tsitologiya i Genetika 2017, vol. 51, no. 5, pp. 82-84

• Botanical Survey of India, Northern Regional Centre, Dehradun – 248 195, Uttarakhand, India
• Department of Botany, Punjabi University, Patiala, Punjab, India

E-mail: puneetbotcyto gmail.com

Puneet Kumar, Singhal V.K., Srivastava S.K. First Detection Of Cytomixis and its consequences in Thalictrum cultratum Wall. (Ranunculaceae), Tsitol Genet., 2017, vol. 51, no. 5, pp. 82-84.

In "Cytology and Genetics":
Puneet Kumar, V. K. Singhal, S. K. Srivastava First detection of cytomixis and its consequences in Thalictrum cultratum Wall. (Ranunculaceae), Cytol Genet., 2017, vol. 51, no. 5, pp. 384-390
DOI: 10.3103/S0095452717050061