Pearson J N, Schweiger P
Soil Science and Plant Nutrition, School of Agriculture, The University of Western Australia, Nedlands, Western Australia 6009.
New Phytol. 1993 Jun;124(2):215-219. doi: 10.1111/j.1469-8137.1993.tb03810.x.
Two time-course experiments were conducted to investigate the relationship between colonization and sporulation by Scutellospora calospora (Nicol. & Gerd.) Walker & Sanders colonizing roots of subterranean clover (Trifolium subterraneum L.). The percentage of root length colonized by S. calospora increased up to 49 d in expt 1 and 32 d in expt 2 after which it declined. At this stage, there was no further increase in mycorrhizal root length but a sharp increase in non-mycorrhizal root length. In expt 1, the soluble carbohydrate concentration of the roots decreased during the first 49 d, followed by a sudden increase, coinciding with the decline in the percentage of root length colonized. One week before this the shoot P inflow also decreased. In both experiments, sporulation by S. calospora occurred after the decline in colonization. During sporulation there is no further spread in colonization within the root, which may result in increases in soluble carbohydrate concentration within the root. Spore formation may be aided by carbon stores located in the external auxiliary bodies formed by species of the genus Scutellospora.
进行了两项时间进程实验，以研究卡洛孢囊霉（Scutellospora calospora (Nicol. & Gerd.) Walker & Sanders）在地下三叶草（Trifolium subterraneum L.）根系上定殖与产孢之间的关系。在实验1中，卡洛孢囊霉定殖的根长百分比在49天内增加，在实验2中在32天内增加，之后下降。在此阶段，菌根根长不再增加，但非菌根根长急剧增加。在实验1中，根系的可溶性碳水化合物浓度在前49天内下降，随后突然增加，这与定殖根长百分比的下降同时发生。在此之前一周，地上部磷流入量也下降。在两项实验中，卡洛孢囊霉的产孢都发生在定殖下降之后。产孢期间，根系内的定殖不再进一步扩展，这可能导致根系内可溶性碳水化合物浓度增加。孢子形成可能得到了由盾孢囊霉属物种形成的外部辅助体中储存的碳的帮助。
