Control of relative growth rate by application of the relative addition rate technique to a traditional solution culture system

1992 ◽  
Vol 142 (1) ◽  
pp. 113-122 ◽  
Author(s):  
K. J. Stadt ◽  
G. J. Taylor ◽  
M. R. T. Dale
Keyword(s):  
Growth Rate ◽  
Relative Growth Rate ◽  
Culture System ◽  
Solution Culture ◽  
Relative Growth ◽  
Addition Rate

Response to salinity in Glycine. 3. Dry matter accumulation in three Australian species and G. javanica

1967 ◽  
Vol 7 (24) ◽  
pp. 50 ◽  
Author(s):  
JR Wilson
Keyword(s):  
Growth Rate ◽  
Relative Growth Rate ◽  
Native Species ◽  
Dry Matter ◽  
Solution Culture ◽  
Dry Matter Accumulation ◽  
Salt Tolerant ◽  
Relative Growth ◽  
Glycine Species ◽  
Free Treatment

In glasshouse solution culture the growth and response to salinity of three native Australian Glycine species, G.falcata Benth., G. tomentella Hayata, and G. tabacina (Labill.) Benth., and two varieties of the introduced species G. javanica L., Cooper and Tinaroo, were compared. Seedlings with five trifoliate leaves received ten days of salinity stress and were then returned to basal nutrient. In the salt-free treatment all species grew well although the relative growth rate of the javanica varieties was slightly higher than the native species. Nevertheless, the yield of G. falcata and G. tomentella was comparable to that of the lavanica varieties ; G. tabacina, however, yielded poorly. The native species also differed from the javancca varieties in seed weight, time trends in distribution of dry matter, and flowering. Yield and relative growth rate declined with increasing salt concentration in all species, and, on return to basal nutrient, recovery in relative growth rate was delayed roughly in proportion to the severity of the previous salt stress. G. javanica var. Cooper was more salt tolerant than G. fomentella, and G. tabacina, and was also the most productive plant at all levels of salinity.

scholarly journals Seed mass effects on germination and growth of diverse European Scots pine populations

1994 ◽  
Vol 24 (2) ◽  
pp. 306-320 ◽  
Author(s):  
P.B. Reich ◽  
J. Oleksyn ◽  
M.G. Tjoelker
Keyword(s):  
Growth Rate ◽  
Relative Growth Rate ◽  
Scots Pine ◽  
Field Experiments ◽  
Seed Mass ◽  
Growing Season ◽  
Turkish Population ◽  
Dry Mass ◽  
Relative Growth ◽  
Mass Effects

Seedlings of 24 European Scots pine (Pinussylvestris L.) populations were grown in controlled environment chambers under simulated photoperiodic conditions of 50 and 60°N latitude to evaluate the effect of seed mass on germination and seedling growth characteristics. Seeds of each population were classified into 1-mg mass classes, and the four classes per population with the highest frequencies were used. Photoperiod had minimal influence on seed mass effects. Overall, seed mass was positively related to the number of cotyledons and hypocotyl height. Populations differed significantly in seed mass effect on biomass. In northern populations (55–61°N), dry mass at the end of the first growing season was little affected by seed mass. However, dry mass in 9 of 15 central populations (54–48°N) and all southern (<45°N) populations correlated positively with seed mass. Relative growth rate was not related to seed mass within or across populations, and thus early growth is largely determined by seed mass. Relative growth rate also did not differ among populations, except for a geographically isolated Turkish population with the highest seed mass and lowest relative growth rate. After one growing season, height was positively correlated (r2 > 0.6) with seed mass in 15 populations. To check the duration of seed mass effects, height growth of 1- to 7-year-old field experiments established with the same seed lots were compared. Seed mass effects on height were strongest for 1-year-old seedlings and declined or disappeared by the age of 5–7 years among central and southern populations, but remained stable over that time in northern populations.

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