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Appl. Sci. 2019, 9(2), 253; https://doi.org/10.3390/app9020253

Genome Size Unaffected by Variation in Morphological Traits, Temperature, and Precipitation in Turnip

1,2,3, 1,2,3, 1,2,3 and 1,2,3,*
1
Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
2
Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
3
Institute of Tibetan Plateau Research at Kunming, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
*
Author to whom correspondence should be addressed.
Received: 11 December 2018 / Revised: 30 December 2018 / Accepted: 4 January 2019 / Published: 11 January 2019
(This article belongs to the Section Applied Biosciences and Bioengineering)
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Abstract

Genome size (GS) was proposed as proxy for gross phenotypic and environmental changes in plants. GS organismal complexity is an enigma in evolutionary biology. While studies pertaining to intraspecific GS variation are abundant, literatures reporting the adaptive significance of GS are largelymissing. During food shortage, Brassica rapa var. rapa (turnip) is used as food and fodder for sustaining the livelihood of residents in the Qinghai Tibetan Plateau (QTP), which is also known as “the roof of the world”. Thus, climatic extremities make this region a natural environment to test adaptive significance of GS variation in turnip landraces. Therefore, from the QTP and its adjacent regions (the Hengduanshan and the Himalayas), we investigated adaptive evolution of GS in turnip landraces. Tuber diameter of turnip landraces was found to be significantly correlated with most of the environmental factors. GS was also shown not to be associated with morphological traits, temperature, and precipitation. Moreover, principal component analyses based on the whole dataset trisected the landraces into three distinct populations based on landrace usage—Hengduanshan, QTP, and the Himalayas. Nonetheless, our cumulative dataset showed evidence of adaptation of turnip landrace to different environments throughnonassociated genomic and phenomic plasticity. View Full-Text
Keywords: adaptive evolution; bioclimatic variables; flow cytometry; genome size; intra-species variation; Qinghai–Tibetan Plateau; seed weight adaptive evolution; bioclimatic variables; flow cytometry; genome size; intra-species variation; Qinghai–Tibetan Plateau; seed weight
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Basak, S.; Sun, X.; Wang, G.; Yang, Y. Genome Size Unaffected by Variation in Morphological Traits, Temperature, and Precipitation in Turnip. Appl. Sci. 2019, 9, 253.

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