Physiological quality of seeds from Passiflora mucronata Lam. genotypes with nitric oxide donor and salt stress

Pub Date : 2023-01-01 DOI:10.1590/0100-29452023551
José Carlos Lopes, Patrick Alves de Oliveira, Rodrigo Sobreira Alexandre, Aressa Oliveira Correia, Guilherme Bravim Canal, Paula Aparecida Muniz de Lima
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Abstract

Abstract The presence of salts in the soil solution reduces the osmotic potential, hindering water absorption by roots. However, plants have defense mechanisms against stresses, releasing signaling molecules, in which nitric oxide plays an important role in the abiotic stress. This study aimed to assess the physiological quality of seeds from Passiflora mucronata Lam. genotypes pre-conditioned with the nitric oxide donor Tadalafil kept under salt stress. Seeds from nine P. mucronata genotypes evaluated under four nitric oxide donor Tadalafil concentrations : 0.0, 1.5, 2.5, 5.0, 7.5, 10.0 and 12.5 mg L-1, applied by soaking seeds for two hours, followed by washing in running water and germination in germitest® paper moistened with NaCl at -1.2 MPa. The experiment was carried out in a completely randomized design, with four replicates of 25 seeds. The nitric oxide donor Tadalafil, at concentrations of 1.5 and 2.5 mg L-1, increased the germination speed, shoot length, and dry mass. Pre-conditioning of seeds with the nitric oxide donor Tadalafil at concentrations of 5.0, 7.5, 10.0, and 12.5 mg L-1 determined the death of seeds. Seeds from genotype G3, pre-conditioned with Tadalafil at concentrations of 1.5 and 2.5 mg L-1, presented higher germination, germination speed index, mean germination time, shoot length, root length and dry matter values. Genotypes presented distinct phenotypic responses, providing intraspecific divergence.
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西番莲种子生理品质研究。一氧化氮供体和盐胁迫基因型
土壤溶液中盐的存在降低了渗透电位,阻碍了根系的吸水。然而,植物对胁迫具有防御机制,释放信号分子,其中一氧化氮在非生物胁迫中起着重要作用。本研究旨在评价西番莲种子的生理品质。在盐胁迫下,用一氧化氮供体他达拉非进行基因型预处理。在4种一氧化氮供体浓度(0.0、1.5、2.5、5.0、7.5、10.0和12.5 mg L-1)的他达拉非下,对9个基因型的麻豆种子进行了评估,方法是将种子浸泡2小时,然后在自来水中洗涤,在-1.2 MPa NaCl润湿的germitest®纸上萌发。试验采用完全随机设计,4个重复,每重复25粒种子。一氧化氮供体他达拉非在浓度为1.5和2.5 mg L-1时提高了种子的萌发速度、芽长和干质量。用浓度分别为5.0、7.5、10.0和12.5 mg L-1的一氧化氮供体他达拉非预处理种子,测定了种子的死亡情况。基因型G3种子经1.5和2.5 mg L-1浓度的他达拉非预处理后,萌发率、萌发速度指数、平均萌发时间、茎长、根长和干物质值均较高。基因型表现出不同的表型反应,提供种内分化。
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