Scheltema M A, Abbott L K, Robson A D, De'ath G
School of Agriculture, University of Western Australia, Nedlands, WA 6009, Australia.
New Phytol. 1987 Aug;106(4):727-734. doi: 10.1111/j.1469-8137.1987.tb00173.x.
The lateral spread of Gigaspora calospora (Nicol. and Gerd.) Gerdemann & Trappe was examined in Trifolium subterraneum L. (subterranean clover) grown on a steamed lateritic podsol. Plants were sown in a sward in pots 29 cm long × 12 cm wide and inoculum of G. calospora was placed at one end. Mycorrhizal infection was estimated 21, 35, 63, 91 and 119 d after sowing at points 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 and 26 cm from the inoculum. The lateral spread of Glotnusfasciculatum (Thaxter sensu Gerd.) through roots of T. subterraneum was measured 35 d after sowing. The percentage root length infected by G. calospora declined exponentially with distance from the inoculum. In contrast, infection by G. fasciculatum spread with a distinct front and hence was best described by a Gompertz curve. The number of spores of G. calospora recovered at increasing distances from the point of inoculation at the final harvest was correlated with the proportion of roots infected at an earlier harvest, and therefore provided a useful measure of the pattern of spread of G. calospora within roots.
在种植于经过蒸汽处理的红土灰化土上的地下三叶草（Trifolium subterraneum L.）中，研究了巨型孢囊霉（Gigaspora calospora (Nicol. and Gerd.) Gerdemann & Trappe）的横向传播情况。将植物播种在长29厘米×宽12厘米花盆中的草皮中，并在一端放置巨型孢囊霉的接种物。在播种后21、35、63、91和119天，在距离接种物2、4、6、8、10、12、14、16、18、20、22、24和26厘米处的点估计菌根感染情况。在播种35天后，测量了束状球囊霉（Glomus fasciculatum (Thaxter sensu Gerd.)）通过地下三叶草根系的横向传播情况。巨型孢囊霉感染的根长度百分比随距接种物距离呈指数下降。相比之下，束状球囊霉的感染以明显的前沿传播，因此用冈珀茨曲线描述最为合适。在最终收获时，从接种点起距离增加时回收的巨型孢囊霉孢子数量与早期收获时感染根的比例相关，因此提供了一种衡量巨型孢囊霉在根内传播模式的有用方法。
