Most commercial tobacco cultivars possess the Rk1 resistance gene to races 1 and 3 of Meloidogyne incognita and race 1 of Meloidogyne arenaria, which has caused a shift in population prevalence in Virginia tobacco fields toward other species and races. A number of cultivars now also possess the Rk2 gene for root-knot resistance.

2021年7月19日 · Rk2 imparts increased resistance to M. javanica when stacked with Rk1 and is becoming commercially available. The efficacy of Rk2 against M. arenaria race 2, which is increasingly prevalent in Virginia, is unclear.

Meloidogyne arenaria race 2 is not controlled by Rk1 and has become prevalent in Virginia. A second form of resistance effective against M. javanica, Rk2, is also increasingly available commercially.

High soil temperatures have been associated with a breakdown of root-knot resistance genes in a number of crops. Three greenhouse trials were performed from 2014 to 2015 investigate the effect of high soil temperature on the efficacy of Rk1 and/or Rk2 genes in reducing parasitism by a population of M. incognita race 3.

2017年7月21日 · Most commercial tobacco cultivars possess the Rk1 resistance gene to races 1 and 3 of Meloidogyne incognita and race 1 of Meloidogyne arenaria, which has caused a shift in population prevalence in Virginia tobacco fields toward other species and races. A number of cultivars now also possess the Rk2 gene for root-knot resistance.

Number of Competitors: 43, Number of NSAs: 13 Rank Bib FIS Name Code NSA YB Code

844 Followers, 505 Following, 47 Posts - See Instagram photos and videos from Racing|ndustries (@rk2_racing)

喜歡玩車的朋友大家好我們是RK2，創辦於2022年，我們來自台灣的改裝品公司至今已經開發了多款改裝套件，內容舉凡鈦金屬加工，外觀套件，不僅僅只是在國內改裝市場發光發熱海外市場也能看見我們產品的身影.

2006年12月5日 · And so, RK2 has taken up the gauntlet, and won the battle of sorts between dimensions, that of being the first to spawn the Artillery Commander. A greater feat, and greater bragging rights lies yet ahead, that of killing this uber boss.

Number of Competitors: 48, Number of NSAs: 13 Rank Bib FIS Name Code NSA YB Code Progression Qualification Race Tie Time Points