The efficiency of prechilling and gibberellic acid (GA3) for breaking thermodormancy in lettuce

IF 1.1 4区农林科学 Q3 AGRONOMY Journal of Seed Science Pub Date : 2022-01-01 DOI:10.1590/2317-1545v44262833

Gamze Kaya

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引用次数: 2

Abstract

Abstract: The study focused on increasing the germination of lettuce cultivars under high-temperature conditions by seed treatments. The seeds of lettuce cultivars Yedikule, Iceberg, Iri Kıvırcık, and BT Iri Kıvırcık with different leaf morphology were primed by different doses of gibberellic acid (GA3) (0, 250, 500, and 1000 ppm) and preconditioned by chilling and heating. The seeds were germinated at optimal (20 °C) and high (35 °C) temperatures. The results showed that high temperature adversely influenced the germination percentage of lettuce cultivars. The mean germination percentage was 16.8% at 35 °C and 93.4% at 20 °C. Also, there was a significant difference among lettuce cultivars for germination at 35 °C. Iri Kıvırcık and BT Iri Kıvırcık showed a severe thermodormancy and hardly ever germinated at 35 °C. Prechilling and preheating promoted germination at 35 °C compared to unprimed seeds, but prechilling resulted in higher germination than preheating. GA3 was found to be the most useful treatment for improving germination compared to the others. The germination percentage of Iceberg, Yedikule, and Iri Kıvırcık primed with GA3 doses reached over 80%. The results suggested that the germination performance of lettuce cultivars suffering from thermodormancy or wherever climatic conditions with high temperatures should be promoted by the application of 500 ppm de GA3.

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预冷与赤霉素酸(GA3)对生菜破温效果的研究

摘要:通过种子处理提高高温条件下生菜品种的萌发率。以不同叶片形态的莴苣品种Yedikule、Iceberg、Iri Kıvırcık和BT Iri Kıvırcık为材料，分别用不同剂量的赤霉素(GA3)(0、250、500和1000 ppm)对其种子进行诱导，并进行冷却和加热预处理。种子在最佳(20°C)和最高(35°C)温度下发芽。结果表明，高温对生菜品种的发芽率有不利影响。35°C和20°C的平均发芽率分别为16.8%和93.4%。在35℃条件下，不同生菜品种的发芽率也存在显著差异。Iri Kıvırcık和BT Iri Kıvırcık表现出严重的热致性，在35℃下几乎不发芽。在35°C条件下，预冷和预热对种子的发芽率有促进作用，但预冷的发芽率高于预热。与其他处理相比，GA3处理对提高种子萌发最有用。经GA3处理后，Iceberg、Yedikule和Iri Kıvırcık的发芽率达到80%以上。结果表明，在高温气候条件下，施用500 ppm de GA3可促进高温环境下的生菜萌发。

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来源期刊

Journal of Seed Science Agricultural and Biological Sciences-Agronomy and Crop Science

CiteScore

2.00

自引率

30.00%

发文量

审稿时长

12 weeks

期刊介绍： From 2017 the Journal of Seed Science (JSS) will circulate online version only. Original scientific studies and communications, not yet published or submitted to another journal for publication and written in Portuguese or English, will be accepted for publication. For manuscripts submitted in English, the authors should provide an adequated version. The SCIENTIFIC COMMUNICATION is a category of scientific manuscript which describes a technique, an equipment, new species or observations and surveys of limited results. It has the same scientific rigor as the “Scientific Articles” and the same value as a publication. The classification of a manuscript as a SCIENTIFIC COMMUNICATION is based on its content and scientific merit but it can be a preliminary study, simple and not definitive on a certain subject, with publication justified by its uniqueness and contribution to the area. The Editorial Board of the JSS may invite leading authors of recognized reputation to compose specific Review Articles covering topics of their specialization that will convey to the scientific community the state-of-the-art knowledge related to the specific theme.