Yu Lijia task force: cysteine-rich peptide signal seisludes to promote genetic isolation among the species of amoeba.

On May 31st, the research paper entitled "The cysteine-rich peptide signal promotes interspecies genetic isolation of apothecomustards" was published online in science magazine.
this paper reveals the molecular signaling mechanism of the reproductive isolation barrier within and between plants.
the study is conducive to future breeding efforts, and the gene pool can be added to the desired agronomic traits of crop plants.
, genetic isolation between species is key to maintaining a species from mixing with other species, and there are a number of factors that can lead to genetic isolation between species.
160 years ago, in his famous Origin of Species, Darwin said that he had personally tested the phenomenon of a plant's pollen "winning" in competition with pollen from other species, arguing that it was important to cause genetic isolation between different species. similar phenomena have been found in animals
, known as "same sperm first", which ensures that the sperm of one species is attracted to the egg cells of the same species, rather than other species, and thus completes subsequent fusion (fertilization) and preserves the pure lineage of the species.
But for more than a century, little is known about the molecular mechanisms of this phenomenon.
previous studies have shown that five members of at-the-cell at-Entor1s, which have a small class of cell-assisted cell secretion in the female reproductive organs of the flowerplant, can specifically attract the species' male cell pollen tubes (which contain sperm cells).
but interestingly, whether it is the small peptide signal AtLURE1, or the receptor that feels the signal, after the loss of function plants can successfully complete the pollen tube attraction and follow-up fertilization process, and produce normal seeds.
this phenomenon prompted researchers to rethink the functionality of at-LURE pollen tubes mediated by AtLURE1.
, the team of StudentSiLiJia of Peking University's School of Life Sciences first discovered two AtLURE1s members with the same function as the five members mentioned above, and then used CRISPR/Cas9 gene knockout technology to obtain a mutant that had been knocked out by all members of the AtLURE1 family, and found that mutant plants could still produce seeds normally.
the results show edified that AtLURE1s, a small peptide with species-specific pollen tube suction activity, is not necessary to complete the pollen tube orientation and subsequent fertilization process.
, what is the biological function of AtLURE1s, these tiny peptide signals of amoeba? They further found that if the pollen of the amoeba and another species close to the amoeba's genus, the pollen of the pheno-mustard, together with the pollen of the pheno-mustard, were awarded to the column head of the amoeba, the pollen tube of the amoeba was given priority in the AtLURE1 signal-normal plant, and the ability of the amoeba to be attracted significantly in the atalure1 mutant plant without the Atlure1 signal was significantly reduced.
the above studies show that AtLURE1s is not the only signal that the female organs secrete to attract male pollen tubes, but rather a type of signal that promotes genetic isolation by increasing the competitiveness of their own pollen tubes and promoting genetic isolation from species close to their kinship;
interesting, yu Lijia team further found that the female organs of amoeba mustard can also secrete four species-specific small peptide signals that attract pollen tubes, these small peptide signals can not only attract the pollen tube of the amoeba, but also attract other close-edge species such as the jaundice nan mustard and the hala's amoeba pollen tube;
this explains why, after all the AtLURE1s genes have been mutated, the pollen tubes of amoeba can still find the embryo beads, complete fertilization and produce seeds. The discovery of the "hydrangea" small peptide signal in
greatly perfected the model of the action of the small peptide signal regulation and the fertilization process of flower plants.
the review of Science, the authors' conclusions will have a profound impact on the relevant research areas, and mean that almost all textbooks published and published after 2009 and the relevant content in the review may have to be rewritten. At the same time,
, it is an exciting view that a pollen tube attractor (XIUQIU) that transcends species barriers exists in conjunction with at-smaller peptides (AtLURE1s), which play a role in reproductive isolation, which will affect the basic theory of plant biology and the practical application of horticulture/agriculture.
it is understood that Yu Lijia, a professor at Peking University's School of Life Sciences, is the communication author of the paper, and his laboratory assistant researcher, Zhong Zhong, And Liu Meiling, a doctoral student at Peking University's School of Life Sciences, and Wang Zhixuan, co-first author of the paper;
the research was funded by the National Natural Science Foundation of China and the Peking University-Tsinghua Joint Life Center.
Source: Guangming Daily.