New Zealand Journal of Crop and Horticultural Science abstracts

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Comparison of diploid and chimeric forms (4x/2x) of Asiatic hybrid lilies (Lilium spp.) under natural and early forcing culture

K. Okazaki

Faculty of Agriculture
Niigata University
Ikarashi, Niigata 950 2181
Japan
email: okazaki@agr.niigata-u.ac.jp

Y. Hane^*

Toyama Vegetable Ornamental Crops Research Station
Tonami, Toyama 939 1327
Japan

^*Present address: Toyama Extension Service for Agriculture, Kurobe, Toyama 938 0801, Japan.

Abstract  A variant of the Asiatic hybrid lilies (Lilium spp.), ‘Kiyotsubeni’, selected by a grower, was similar to the original form but displayed slight morphological differences. We determined that this variant form was a tetraploid/diploid periclinal chimera based on stomatal guard cells, pollen size, and chromosome number. Morphological and physiological changes associated with polyploidisation were identified by comparing diploid and chimeric forms (4x/2x) of ‘Kiyotsubeni’ under natural conditions and early forcing culture. Under early forcing culture, the chimeric form flowered earlier and displayed a shorter stem and broader leaves than the diploid form. The chimeric form also had a softer stem. Diploid ‘Kiyotsubeni’ was more susceptible to leaf scorch than the chimeric form. These results demonstrate that differences in ploidy influence agronomic traits and that the periclinal chimera (4x/2x) is effective for generating resistance against leaf scorch.

Keywords  Lilium; colchicine; cut-flower production; polyploidy

H04021; Online publication date 15 July 2005 Received 26 February 2004; accepted 26 May 2005
New Zealand Journal of Crop and Horticultural Science, 2005, Vol. 33: 261-267
0014-0671/05/3303-0261 © The Royal Society of New Zealand 2005

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