TABLE 2.

Changes in virus populations during systemic infection of Cucumber mosaic virus

Plant no. and tissue originb	Expt no. and characteristicsa
	1		2
	No. of mutants recovered	Compositions of the population	No. of mutants recovered	Compositions of the population
1, In	12	abcdefgijkmn	12	abcdefgijkmn
1, A	4	eijn	5	adejn
1, B	6	degijk	5	cdjkn
1, C	6	degijk	6	cdegjn
2, In	12	abcdefgijkmn	12	abcdefgijkmn
2, A	6	cdgikn	5	acdin
2, B	5	cdgkn	6	cdgijn
2, C	5	cdikn	6	cdfgin
3, In	12	abcdefgijkmn	12	abcdefgijkmn
3, A	8	abcdeijn	8	acdeijmn
3, B	8	abcdjmnj	8	acdeijmn
3, C	8	abefgijn	8	abdeijmn

^aFor experiment 1, the population of the mutant viruses was inoculated to a small area of the fifth leaf on tobacco at the seven-leaf stage, and the inoculated leaves were detached at 2 dpi. For experiment 2, the population of mutant viruses was inoculated to the whole fifth leaf of tobacco at the seven-leaf stage, and the inoculated leaves were detached at 6 dpi.

^b1, 2 and 3 represent the three analyzed plants. In, inoculated leaf; A, B, and C, tissues from different locations of the same systemic leaf (eighth leaf).