Variation and Selection within Clonal Lines of LEMNA MINOR.

PAGE INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I51 Material used ............................................................... .. I51 Variation within a wild population .... .. ............ ...... ..................... 152 Shape of frond ....................................................... I52 Speed of budding .....................,................................ I54 Variation in the habit of root growth.. . . . . . ... . . . . . . . . . . . . . . . . . . . . . . . . . . 156 Variation in size of fronds ... .......................................... 158 Variation and selection in clonal lines ... . . . .. . . . . . .. .. . . .. . . . .. . .. . ..... .. .. . . . . 159 Variation and selection in shape of frond ............................... I59 Effect of cul'ture media ... .. . . . . ., .. . .. . . .. . ... .. . .. .. . . . . . . . .. . ..... .. 160 Inheritance of shape within a clone.. . . . . . , . . . . . . . . . . , . . . . . . . . . . .. . . . . . . 161 Unusual non-heritable variations in frond shape. . . . . . . . . . . . . . . . . . . . . . . . . 164 Clonal variation and selection in speed of propagation.. . . . . . . . . . . . . . . . . . 164 Clonal variation in size of frond ..... ... , ............ .............. ..... 169 Effect of culture media on clonal size variation.. , . . . . . . . . . . . . . . . . . . . . . . 172 Inheritance of acquired size ............................................ 173 Inheritance of decreased size.. . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . .. . 173