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Estimation of Chilling and Heat Requirements of Thorny and Thornless Blackberry Cultivars Under Laboratory Conditions
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Somayeh Tabari   , Mehdi Hadadinehjad , Reza Noruz |
| Sanru |
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Abstract: (505 Views) |
In order to determine the chilling and heat requirements of blackberry cultivars, three thorny (Tupi, Marion, Silvan) and thornless (Merton) cultivars were collected from the blackberry collection of Sari of Agricultural Sciences and Natural Resources University (SANRU) placed in the refrigerator. Treatments were included cultivars and chilling hours (300,500,700,900, 1100 and1300) in three replications and 10 samples. Then the floricanes were placed in the greenhouse under 16 hours of light and 24 ° C and the number of days to flowering of the first bud, the number of days to flowering of 50% of buds and the final percentage of bud breaks were recorded and the heat requirement was calculated. The results showed the highest rate of first bud burst occurred in the thorny cultivars of Silvan, Marion and Tupi in 700 hours of chilling and the cultivar thornless Merton in 500 hours of chilling. Among the thorny cultivars, two very early and late cultivars (Silvan and Marion) in 700 hours and late cultivar (Tupi) in 300 hours of chilling reached 50% full bloom earlier. While thornless Merton cultivar reached this level with 1100 hours of chilling. Examination of heat requirements of different cultivars showed in thorny cultivars, with increasing chilling hours, the need for heat decreases. So that all three cultivars of Silvan, Marion and Tupai in 300 hours of chilling, needed more heat, which has decreased with the increase of chilling hours until reaching 700 hours. In thornless Merton cultivar, from 300 hours of chilling to 700 hours, the need for heat has decreased, but after that, reaching 900 to 1300 hours of chilling, the need for heat has also increased. In general, thorny cultivars needed less chilling than thornless cultivars to open the first bud and achieve full flowering. Therefore, cultivation of thornless cultivars in areas with chilling units of less than 500 hours is difficult and requires additional treatments. |
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| Keywords: Floricane, Lateral Bud, Chilling, Burst |
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Full-Text [PDF 468 kb]
(121 Downloads)
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Type of Study: Research |
Subject:
Postharvest physiology
Received: 2022/04/30 | Accepted: 2022/12/11 | Published: 2024/05/18
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