Increased relative growth rate of normal rat cells in vitro with crocetin

1977 ◽  
Vol 33 (8) ◽  
pp. 1028-1028 ◽  
Author(s):  
E. S. Wilkins ◽  
J. L. Gainer ◽  
M. G. Wilkins
Keyword(s):  
Growth Rate ◽  
Relative Growth Rate ◽  
Relative Growth ◽  
Normal Rat

scholarly journals In vitro application of integrated selection index for screening drought tolerant genotypes in common wheat

2016 ◽  
Vol 107 (2) ◽  
pp. 335 ◽  
Author(s):  
Ezatollah FARSHADFAR ◽  
Reza Amiri
Keyword(s):  
Growth Rate ◽  
Drought Tolerance ◽  
Relative Growth Rate ◽  
Selection Index ◽  
Proline Content ◽  
Fresh Mass ◽  
Relative Growth ◽  
Mass Growth ◽  
Drought Tolerant

<p style="margin: 0cm -0.05pt 0pt 0cm; text-align: justify; line-height: normal; tab-stops: 453.55pt;"><span style="font-size: 9pt;" lang="EN-GB"><span style="font-family: Times New Roman;">This experiment was conducted on 20 wheat genotypes during 2010-2011 growing season at the Razi University, Kermanshah, Iran. A completely randomized design with six replications was used for callus induction and a 20 × 2 factorial experiment with three replications was used for response of genotypes to <em>in vitro</em> drought stress. ANOVA exhibited highly significant differences among the genotypes for callus growth rate, relative fresh mass growth, relative growth rate, callus water content, percent of callus chlorosis and proline content under stress condition (15 % PEG). PCA showed that the integrated selection index was correlated with callus growth index, relative fresh mass growth, relative growth rate and proline content indicating that these screening techniques can be useful for selecting drought tolerant genotypes. Screening drought tolerant genotypes and <em>in vitro</em> indicators of drought tolerance using mean rank, standard deviation of ranks and biplot analysis, discriminated genotypes 2, 18 and 10 as the most drought tolerant. Therefore they are recommended to be used as parents for genetic analysis, gene mapping and improvement of drought tolerance.</span></span></p>

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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