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Breeding decaploid strawberry with improved cold resistance and fruit quality

Luo, Gangjun, Xue, Li, Xu, Wenji, Zhao, Jun, Wang, Jian, Ding, Yan, Luan, Kun, Lei, Jiajun
Scientia horticulturae 2019 v.251 pp. 1-8
anthocyanins, antioxidant activity, ascorbic acid, cold, cultivars, fruit quality, fruits, hybrids, parents, phenols, reciprocal crosses, seedlings, strawberries, total soluble solids
The reciprocal crosses of Akihime (8x) and YH15-10 (12x), Sagahonoka (8x) and YH15-10, and Tokun (10x) and AY175 (10x) were performed to select decaploid (10x) seedlings with improved cold resistance and fruit quality of strawberry. The hybrids were obtained from any other cross combinations except for YH15-10 × Sagahonoka. All of the observed hybrids were decaploids except for one enneaploid (9x) from the cross of Akihime × YH15-10. Some of the decaploid hybrids from the five cross combinations had obviously increased in cold resistance. For instance, 80.00% and 75.00% hybrids respectively from YH15-10 × Akihime and AY175 × Tokun showed higher cold resistance than their lower cold resistant parent ‘Akihime’ and ‘Tokun’. The mean LT50 value of hybrids from YH15-10 × Akihime was -16.6 ℃, which was the highest among the five cross combinations. There was an obvious improvement in fruit quality, some of the hybrids exhibited larger fruit, higher contents of soluble solids, vitamin C, anthocyanin, total phenol and total antioxidant capacity compared to their parents and standard cultivar ‘Sachinoka’. In summary, 18 advanced decaploid selections showed substantial improvement for cold resistance and fruit quality. These decaploid selections have potential values in commercial production and cultivar improvement.