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IMAGE: Mechanisms of symbiotic engagement three principles by which plants may select for or restrict potential mutualists or pathogens. view more
Credit: David Thoms, Yan Liang, and Cara H. Haney
Plants are constantly exposed to microbes: pathogens that cause disease, commensals that cause no harm or benefit, and mutualists that promote plant growth or help fend off pathogens. For example, most land plants can form positive relationships with arbuscular mycorrhizal fungi to improve nutrient uptake. How plants fight off pathogens without also killing beneficial microbes or wasting energy on commensal microbes is a largely unanswered question.
In fact, when scientists within the field of Molecular Plant-Microbe Interactions were asked to come up with their Top 10 Unanswered Questions, the #1 question was How do plants engage with beneficial microorganisms while at the same time restricting pathogens? Put more simply, how do plants tell good microbes from
hoping someone will step forward with new information to help police. reporter: there is a peace sign that has been made with rocks out in front of the home where 20-year-old christopher cummings was shot and killed over the weekend. on monday his uncle congressman elijah cummings talked about this devastating loss. my nephew was just truly was an amazing young man. if you ever met him, you would say i d love to have him for a son. reporter: the congressman told us his nephew would have succeeded in anything he attempted to do in life. he enjoyed attending old dominion university and was aware that his home, even though very close to school, was not in the safest neighborhood. there had been an attempted robbery sometime earlier about five weeks ago and i think he was aware very much of the criminal element and may not have taken it may have assumed that it was not as dangerous as it was. reporter: the shooting of christopher and his roommate has sparked action by
from where they live now? yes. mr. clark was brought over here from montgomery county earlier today. reporter: motive, i know a lot of people out there familiar with this case, they are wondering what could have motivated this crime. mr. deaner was considered well liked in the community and didn t have any enemies. we learned from police when we covered the date of the original crime, and what do we know about this? we don t believe the suspects knew the victim at this time. thank you for joining us. we ll continue to work this story and bring you more tonight at 6:00 and 10:00. back to you. will, thank you. a bomb threat on metro paralyzed the red line for hours this morning. tonight the woman accused of making the threat is being held for a mental evaluation. details are emerging about the possible motive. sherry ly is covering this one tonight from the news room. reporter: people described the situation as pure panic. this happened at about 7:45 during peak m
for joining us tonight for nissan sports xtra. i m lindsay murphy. coming up i go one on one with the terps new hoops coach mark turgeon plus the thunder rolls in the nba playoffs but first let s hit the diamond. 2010 is a year nats pitcher jason marquis would like to forget. not only did he miss most of the season following elbow season, but he also won just two of his 13 starts. this year he s back not only with his pitching but his hitting as well. marquis was looking to improve to 5-1 with a victory today. he would get run support early on, already up 1-0 on the marlins in the 1st. look at pudge rodriguez delivering a bases loaded single into right. jayson werth comes around to score and the nationals have a 3-0 lead. still in the 1st leading 4-0 marquis helps his own cause with two on. he goes off o and that would slate harrison and cora. once they find the ball they ll gun down marquis at 3rd. remember, the nats couldn t even score one run yesterday. it s now a 6-2 game