. Annual report of the North Carolina Agricultural Experiment Station . m> 1 # 7xw 3tJ The Bulletin 33 pistils (see Fig. 13, and Plate II, Figs. 1-3). In fact, many pistillaterudiments in flowers on staminate vines are larger than many similarrudiments in flowers on hermaphrodite vines. With this variation ofthe pistils in mind, it is not difficult to imagine that by a sudden releasefrom an inhibiting factor these pistils, so long suppressed, have sud-denly grown out and become Fig. 14.—Variations in size of the pistils frequently found on the hermaphrodite seedlingsof Hope whi
. Annual report of the North Carolina Agricultural Experiment Station . m> 1 # 7xw 3tJ The Bulletin 33 pistils (see Fig. 13, and Plate II, Figs. 1-3). In fact, many pistillaterudiments in flowers on staminate vines are larger than many similarrudiments in flowers on hermaphrodite vines. With this variation ofthe pistils in mind, it is not difficult to imagine that by a sudden releasefrom an inhibiting factor these pistils, so long suppressed, have sud-denly grown out and become Fig. 14.—Variations in size of the pistils frequently found on the hermaphrodite seedlingsof Hope which hear the upright stamens. Cluster on the left represents the normaltype of pistil, while cluster on the right shows considerable reduction in size of thepistils. Natural size. 34 The Bulletin The strongest link in the chain of evidence yet secured, which pointsout that the Hope vine is essentially a staminate vine with its suppressedpistils regenerated, lies in the evidence already submitted, to the effectthat although fertile when treated with pollen from the same or similarflowers, these pistils are often unfertile when treated with pollen from astaminate vine. Whether our race of self-fertile hermaphrodite vines represents aprogressive step in the line of the evolution of rotundifolia grape flowersis a question that is not so easily proven. The fact that staminate vinesshow much variation in the size of the suppressed pistils, and that allof the hermaphrodite vines which functi
Size: 1665px × 1501px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauth, bookcentury1900, bookdecade1910, booksubjectagriculture
