The diploid wound calluses were respectively treated by colchicine of 200mg/kg, 500mg/kg, 800mg/kg and 1000mg/kg. The clonal lines of autotetraploid in naked seed rice were obtained in all treatments. The induced effects were better in 500～1000mg/kg, 800mg/kg was the best and its doubling efficiency was up to 30 0%.
2) One clonal line Z_ 1-1-1 were obtained through high temperature stress selection, and the regenerated plants of Z_ 1-1-1 were more tolerant to high temperature than their explants source genotype(Z_1).
cv.‘I 69/ 55’and P.nigra L., P.×eur. cv.‘I 72/58’and P.nigra L.. It is more possible to select the clonal line of fast grow, resistance to black spot for selecting individual of morphological character being similar to female parent than hybrid F 1 of being similar to male parent or intermediate character among P. × del .
In order to identify the optimum cutting density for producing the highest number of plantable seedlings of poplar clones, a split-plot randomized block design was used to establish four cutting densities in plots.
Results indicated that the leaf area, stem and leaf biomass, and caliper of seedlings of all four poplar clones increased with the decrease in cutting density.
The quantity of first-grade seedlings (grade I) for clones Nanlin-95 and Nanlin-895 was achieved at the spacing of 40 cm×50 cm; for NL-1388 and NL-80351, it was 50 cm×50 cm.
According to the seedling quality and the number of plantable seedlings produced, the suggested cutting density for these four poplar clones was 50,000 stems/hm2.
Foliar Carbon Isotope Composition (δ13C) and Water Use Efficiency of Different Populus deltoids Clones Under Water Stress
Establishment of the diploid gynogenetic hybrid clonal line of red crucian carp × common carp
The establishment of the diploid gynogenesis clonal line (G1, G2 and G3) provided the evidence that the diploid eggs were able to develop into a new diploid hybrid clonal line by gynogenesis.
However, a colony of these ants does not always comprise members derived from a single clonal line.
The genetically monomorphic subcolonies (single clonal line) always fused into a single nest; however, the genetically polymorphic subcolonies (multiple clonal lines) did not tend to form a single colony.
PC-12 cells (a clonal line of rat phaeochromocytoma cells) take up noradrenaline by a transport system which is identical with the neuronal amine transport system ("uptake1").