Naresh Madhvi, Khan Zainul Abdeen, Kumar Rohit, Kale Sumit P, Patil Vijay M, Rajput Jaising C, Dasgupta Indranil
1Department of Plant Molecular Biology, University of Delhi South Campus, New Delhi, 110021 India.
Nirmal Seeds Private Limited, Bhadgaon Road, Pachora, Jalgaon, Maharashtra 424201 India.
Virusdisease. 2019 Dec;30(4):511-525. doi: 10.1007/s13337-019-00551-4. Epub 2019 Oct 29.
Bhendi yellow vein mosaic disease (BYVMD) and Okra enation leaf curl disease (OELCuD) are common diseases of okra/bhendi [ (L.) Moench] affecting both pod yield and quality in the Indian subcontinent. BYVMD is caused by the infection of a begomovirus and associated betasatellite. In this study, we have made an attempt to investigate the diversity of begomoviral and the satellite sequences in okra samples showing BYVMD and OELCuD, by using a rapid PCR-based approach on 46 samples collected from 23 locations of Southern and Western India. We have also analyzed nine RCA-generated full-length begomoviral clones, some generated from the above samples displaying BYVMD and some OELCuD. By the PCR approach, we find the presence of begomovirus okra enation leaf curl virus (OELCuV) in most samples, irrespective of the disease being displayed (BYVMD or OELCuD). The nine apparently full-length sequences also show high identities with OELCuV and show instances of both intra-specific as well as intra-strainal recombination. We have also analyzed the begomoviral sequences associated with BYVMD and OELCuD from publicly available nucleotide sequence databases and show much higher sequence diversity amongst BYVMV, as compared to OELCuV. This is the first study which comprehensively demonstrates the presence of OELCuV in okra samples showing BYVMD and those showing OELCuD.
黄秋葵脉花叶病(BYVMD)和秋葵耳突叶卷曲病(OELCuD)是秋葵常见病害,在印度次大陆影响荚果产量和品质。BYVMD由菜豆金色花叶病毒属病毒和相关的β卫星感染引起。在本研究中,我们尝试通过基于PCR的快速方法,对从印度南部和西部23个地点采集的46份秋葵样本进行检测,这些样本表现出BYVMD和OELCuD症状,以此来研究秋葵样本中菜豆金色花叶病毒属病毒和卫星序列的多样性。我们还分析了9个滚环扩增产生的全长菜豆金色花叶病毒属病毒克隆,其中一些来自表现BYVMD症状的样本,一些来自表现OELCuD症状的样本。通过PCR方法,我们发现大多数样本中都存在秋葵耳突叶卷曲病毒(OELCuV),无论表现出的病害是BYVMD还是OELCuD。这9个明显的全长序列也与OELCuV具有高度同源性,并显示出种内和株内重组的实例。我们还从公开的核苷酸序列数据库中分析了与BYVMD和OELCuD相关的菜豆金色花叶病毒属病毒序列,结果表明,与OELCuV相比,BYVMV之间的序列多样性要高得多。这是第一项全面证明在表现BYVMD症状和OELCuD症状的秋葵样本中存在OELCuV的研究。