Effects of temperatures on pollen germination and pollen tube growth in apple

IF 1.2 4区 农林科学 Q2 AGRICULTURE, MULTIDISCIPLINARY
Mewuleddeg Zebro, Joonsung Kang, J. Heo
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引用次数: 1

Abstract

: Apple cultivars in Korea have been experiencing poor fruit sets due to early spring low temperatures and global warming. Therefore, the present study aimed to investigate the effects of temperature on fruit setting and to select apple cultivars tolerant to extreme temperatures based on the temperature response of their pollen. The effect of temperature on pollen germination percentage (PGP) and on pollen tube length (PTL) was determined under laboratory conditions using the pollen of ten apple cultivars. The two parameters were evaluated using a pollen germination medium, at temperatures ranging from 5 to 45 °C, at 5 °C intervals. The temperature variations considerably affected pollen germination and tube growth in all the examined cultivars. The maximum pollen germination percentage ranged from 61.5 (“Green Ball”) to 99.9% (“Shinano Gold”) with a mean of 85.2%, whereas the maximum pollen tube length ranged from 716.5 (“Tsugaru”) to 989.8 µm (“Arisoo”) with mean of 855.1 µm. There were differences in the cardinal temperatures (T min , T opt , and T max ) of PGP and PTL between cultivars. Mean cardinal temperatures T min , T opt , and T max computed using the modified bilinear model were 4, 27.7, and 44.9 °C and 6.3, 28.6, and 43.7 °C for PGP and PTL, respectively. Our preliminary results may be used to select low-temperature and global warming-friendly apple cultivars for farmers and can also be exploited to develop temperature-tolerant apple cultivars during flowering.
温度对苹果花粉萌发和花粉管生长的影响
△受早春低温和全球变暖等因素的影响,韩国的苹果品种正面临着坐果不佳的问题。因此,本研究旨在研究温度对坐果的影响,并根据花粉的温度响应选择耐极端温度的苹果品种。以10个苹果品种的花粉为材料,在室内条件下测定了温度对花粉发芽率和花粉管长度的影响。使用花粉萌发培养基,在5 - 45°C的温度范围内,每隔5°C对这两个参数进行评估。温度变化对所有品种的花粉萌发和管状生长均有显著影响。最大花粉发芽率为61.5 ~ 99.9%(“绿球”),平均为85.2%;最大花粉管长度为716.5 ~ 989.8µm(“金野”),平均为855.1µm。PGP和PTL的基本温度(T min、T opt和T max)在不同品种间存在差异。采用改进双线性模型计算的平均基数温度T min、T opt和T max分别为4、27.7和44.9°C, PGP和PTL分别为6.3、28.6和43.7°C。我们的初步研究结果可用于为农民选择低温和全球变暖友好型苹果品种,也可用于开发开花期间的耐温苹果品种。
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来源期刊
Bragantia
Bragantia AGRICULTURE, MULTIDISCIPLINARY-
CiteScore
2.40
自引率
8.30%
发文量
33
审稿时长
4 weeks
期刊介绍: Bragantia é uma revista de ciências agronômicas editada pelo Instituto Agronômico da Agência Paulista de Tecnologia dos Agronegócios, da Secretaria de Agricultura e Abastecimento do Estado de São Paulo, com o objetivo de publicar trabalhos científicos originais que contribuam para o desenvolvimento das ciências agronômicas. A revista é publicada desde 1941, tornando-se semestral em 1984, quadrimestral em 2001 e trimestral em 2005. É filiada à Associação Brasileira de Editores Científicos (ABEC).
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