Internode Length in Pisum

These results show similar trends to the differences found between Na and na plants for cell length and number in light-grown plants

James B. Reid

2008

Scholarcy highlights

  • Internode length in light-grown peas is controlled by the interaction of genes occupying at least five major loci, line 77, La, Cry, Na, and Lm
  • The effect on cell length was still not the major cause of the decreased internode length in the cortical tissue of nana plants, the number of cells per internode still being primarily responsible. These results show similar trends to the differences found between Na and na plants for cell length and number in light-grown plants
  • The results clearly indicate that the alleles at the three internode length loci, Le, Na, and Cry have an effect on growth in complete darkness as well as in the light
  • Since the na and le genes have been shown to cause a reduction in internode length in light-grown plants by influencing gibberellin metabolism, it would appear that gibberellins are limiting for growth in complete darkness
  • 1618, an inhibitor of gibberellin synthesis, can dramatically reduce elongation in dark-grown dwarf and tall plants, an effect that can be largely overcome by the application of GA3
  • No significant difference in cell lengths was found when cells from dark-grown tall and dwarf segregates were measured
  • Even slender plants are significantly shorter when grown in the light by comparison to plants grown in complete darkness
  • The enhancement of leaf development in plants carrying the na gene or treated with AMO 1618 would suggest that the gibberellins in dark-grown plants exert some influence over this developmental process

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