Most ebook files are in PDF format, so you can easily read them using various software such as Foxit Reader or directly on the Google Chrome browser.
Some ebook files are released by publishers in other formats such as .awz, .mobi, .epub, .fb2, etc. You may need to install specific software to read these formats on mobile/PC, such as Calibre.
Please read the tutorial at this link: https://ebookbell.com/faq
We offer FREE conversion to the popular formats you request; however, this may take some time. Therefore, right after payment, please email us, and we will try to provide the service as quickly as possible.
For some exceptional file formats or broken links (if any), please refrain from opening any disputes. Instead, email us first, and we will try to assist within a maximum of 6 hours.
EbookBell Team
4.4
102 reviewsFertilization of the egg cell by more than one sperm cell results in aneuploidy and genomic dysfunction. Toavoid this, flowering plants have intricate polytubey block mechanisms that prevent additional pollen tubesfrom entering the ovule. In one mechanism for blocking polytubey, the fertilized egg cell secretes the asparticendopeptidases EGG CELL-SPECIFIC1 (ECS1) and ECS2, which degrade pollen tube attractants. However,the mechanism underlying the egg-cell-specific expression of ECS1 and ECS2 was unknown. Here, wedemonstrate that in Arabidopsis thaliana egg cells, SMALL RNA DEGRADING NUCLEASE (SDN) degradesmicroRNAs (miRNAs) targeting ECS genes, thereby allowing ECS1 and ECS2 to accumulate in egg cells toestablish the polytubey block. Like Arabidopsis ecs1 ecs2 mutants, sdn1 sdn2 sdn3 mutants exhibited polytubey, as did plants specifically overexpressing miRNAs targeting ECS genes in egg cells. Therefore, theSDN-miRNA-ECS module allows ECS accumulation in egg cells to block polytubey.
