Interspecific hybrids between <Emphasis Type="Italic">Chrysanthemum grandiflorum</Emphasis> (Ramat.) Kitamura and <Emphasis Type="Italic">C. indicum</Emphasis> (L.) Des Moul. and their drought tolerance evaluation |
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| Authors: | Chun-Qing Sun Fa-Di Chen Nian-Jun Teng Zhao-Lei Liu Wei-Min Fang Xi-Lin Hou |
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| Institution: | (1) College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China;(2) State Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing, 210095, China; |
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| Abstract: | Chrysanthemum grandiflorum ‘Yuhuaxingchen’ is an important commercial chrysanthemum cultivar with excellent ornamental quality but low drought tolerance,
whereas C. indicum has exceptional drought tolerance. In our earlier study, many hybrid seeds between them were obtained through interspecific
hybridization. In the present study, we selected six putative hybrid lines with most drought tolerance from all the hybrid
lines by withholding water, indentified their facticity by chromosome counting, and then evaluated their drought tolerance
through determining foliar electrolyte leakage (EL), contents of malondialdehyde (MDA) and proline, and plant survival rate
after 20% polyethylene glycol 6000 treatment. It was found that 155 out of 282 seeds germinated and only 132 seedlings survived.
In addition, chromosome and morphological analysis showed that the six putative hybrids were real hybrids and their morphological
features were intermediate between their parents. Furthermore, the density of leaf epidermal hair, proline content, and plant
survival rate were the highest in C. indicum and the lowest in C. grandiflorum among the six hybrids and their parents. In contrast, EL value and MDA content were the highest in C. grandiflorum and the lowest in C. indicum. These results suggest that some true hybrids with improved drought tolerance can be obtained through interspecific hybridization
in chrysanthemum breeding. Therefore, interspecific hybridization between chrysanthemum cultivars and their wild species may
become a promising way to improve their biotic and abiotic resistance in the future breeding. |
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