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https://doi.org/10.2478/botcro-2019-0010

A cytogenetic and pollen study of annual Medicago species from Soummam Valley (Northeastern of Algeria)

Linda Djafri-Bouallag orcid.org/0000-0002-7476-8245 ; Laboratory of Ecology and Environment, Department of Environment Biological Sciences, Faculty of Nature and Life Sciences, Université de Bejaia, Targa Ouzemmour, 06000 Bejaia, Algeria
Malika Ourari ; Laboratory of Ecology and Environment, Department of Environment Biological Sciences, Faculty of Nature and Life Sciences, Université de Bejaia, Targa Ouzemmour, 06000 Bejaia, Algeria
Mohamed Sahnoune ; Laboratory of Ecology and Environment, Department of Environment Biological Sciences, Faculty of Nature and Life Sciences, Université de Bejaia, Targa Ouzemmour, 06000 Bejaia, Algeria

Sažetak

This paper reports a cytogenetic study of eight Medicago L. species sampled from the Soummam Valley (northeastern Algeria). Chromosome numbers and meiosis irregularities during microsporogenesis were explored. Pollen viability rate and pollen size were also examined. The studied taxa are diploid and display bivalent
pairing and regular chromosome segregation during meiosis. Although meiosis appears regular, some anomalies were detected in relatively high cumulated rates (14.66%–26.14%). The most common meiotic abnormality examined here is related to cytomixis (from 14.66% in M. littoralis to 25.83% in M. laciniata). Other anomalies were also etected, including chromatic bridges, asynchronous divisions, micronuclei and multipolar cells. Consequently, the species exhibited varying ercentages of pollen viability (from 70.11% in M. laciniata to
99.14% in M. littoralis). Pollen viability was negatively correlated with meiotic abnormalities (Pearson correlation coefficient R = −0.72, p = 0.043). The pollen grains were also heterogeneous in size. Medicago truncatula Gaertn. and M. laciniata (L.) Miller presented the most variable pollen size (relative standard deviation exceeding 19%). Medicago littoralis is distinguished from other species by possessing homogeneous and large sized pollen (relative standard deviation RSD = 6.73 %). The cytogenetic and pollen data provided by this study are
discussed in the context of species systematics and in the perspective of genetic improvement.

Ključne riječi

chromosome numbers; Medicago; meiotic abnormalities; microsporogenesis; pollen grain area; pollen viability; Soummam Valley

Hrčak ID:

218298

URI

https://hrcak.srce.hr/218298

Datum izdavanja:

1.4.2019.

Posjeta: 1.557 *