Evaluation of Primary Conditional Dormancy in Seeds of Oilseed Rape (Brassica napus) Produced in Golestan and Mazandaran Provinces

Maleki, Keyvan; Soltani, Elias; Alahdadi, Iraj; Javid, Majid Ghorbani

doi:10.29252/yujs.6.2.31

Cited by 1 publication

(3 citation statements)

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“…Changing temperature thresholds (i.e. lower or higher limit temperatures) have been used to explain changes in seed germination behaviour during dormancy loss in seeds of several species of differents families, including Brasicaceae (Del Monte and Tarquis 1997, Soltani et al 2017a, 2019, Maleki et al 2020, Sapindaceae , PolygonaceaeBatlla and Benech-Arnold 2004 and Hamamelidaceae (Maleki et al 2021a). Population thermal parameters (i.e.…”

Section: Discussionmentioning

confidence: 99%

“…After collection, seeds were immediately tested for germination in petri dishes watered with distilled water (control) at six incubation temperatures (5, 10, 15, 20, 25 and 30°C) and alternating light and darkness (12 h/12 h). Remaining seeds were dry stored at 20°C and darkness for three months (Maleki et al 2020) and were tested for germination in GA 3 (100 ppm-GA 3 powder was added to distilled water) at six incubation temperatures (5,10,15,20,25 and 30°C) and alternating light and darkness (12 h/12 h). The aim of this treatment was to have non-dormant seeds and to compare fresh seeds versus non-dormant seeds.…”

Section: Primary Dormancymentioning

confidence: 99%

“…Soltani et al (2019) indicated that seeds of B. napus must have CD at the harvest time but in the previous studies germination of fresh seeds was not measured at the wide range of temperatures. Maleki et al (2020) investigated germination of B. napus at the harvest time and showed that cardinal temperatures (T b , T o and T c ) changed as affected by dormancy breaking treatments (GA 3 and after-ripening). Batlla and Benech-Arnold (2015) distinguished between dormancy thermal parameters (T l and T h which are normally distributed within the population) and germination thermal parameters (T b , T o and T c , which are unique, and thermal time which is normally distributed).…”

Section: Introductionmentioning

confidence: 99%

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A quantitative analysis of primary dormancy and dormancy changes during burial in seeds of Brassica napus

Maleki

Soltani

Arabhosseini

et al. 2021

Nordic Journal of Botany

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For plants inhabiting unpredictable environments, scheduling germination can be challenging. Various responses to environmental conditions have been evolved by plants; these responses combine with variation in local climate to construct germination niche. Germination process may be regulated by a number of factors, among them, the type of seed dormancy and dormancy cycling play an important role in promoting survival after dispersal. In the present study, seeds of Brassica napus were tested for primary conditional dormancy (CD). Dormancy changes were quantified through seed population thermal germination parameters to test whether different genotypes of B. napus seeds (944, 966, Alestrom, Danube, Okanto and Rohan) are non‐dormant (ND) at the maturity or if they present primary dormancy (D or CD). In a burial experiment, B. napus seeds dormancy cycling in the natural soil seedbank was investigated. Germination of all genotypes decreased at 5 and > 20°C, showing narrower breadth of thermal niche for germination. Dormancy‐breaking treatments lead to the widening of thermal range permissive for germination. The lower limit (Tl(50)) and higher limit (Th(50)) temperatures for germination decreased and increased, respectively, for non‐dormant (after‐ripened seeds treated with GA3) seeds compared with fresh seeds in all genotypes. In fresh seeds, the Tl(50) and Th(50) for various genotypes ranged from 3.61 to 6.5°C and 25.0 to 29.0°C, respectively and ranged from 0.2 to 1.8°C and 35 to 41.0°C in non‐dormant seeds. Thus, fresh seeds of B. napus are dormant at dispersal and adopt delayed germination strategies to avoid summer drought. In the burial experiment, the results indicated that B. napus must have D/ND cycle in which fresh seeds first become dormant and then the cycle begins (CD→D↔CD↔ND), thus adopting both risk‐prone and risk‐adverse strategies to spread the likelihood of survival over time.

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Section: Discussionmentioning

confidence: 99%

Section: Primary Dormancymentioning

confidence: 99%