scholarly journals Relationships between the growth direction of primary roots and shoot growth in rice plants.

1987 ◽  
Vol 56 (4) ◽  
pp. 530-535 ◽  
Author(s):  
Shigenori MORITA ◽  
Akira IWABUCHI ◽  
Koou YAMAZAKI
Keyword(s):  
Shoot Growth ◽  
Growth Direction ◽  
Rice Plants ◽  
Primary Roots

scholarly journals Relationships between the growth direction of primary roots and yield in rice plants.

1986 ◽  
Vol 55 (4) ◽  
pp. 520-525 ◽  
Author(s):  
Shigenori MORITA ◽  
Akira IWABUCHI ◽  
Koou YAMAZAKI
Keyword(s):  
Growth Direction ◽  
Rice Plants ◽  
Primary Roots

scholarly journals Species and Their Relationships with Air and Soil Temperatures

1999 ◽  
Vol 9 (1) ◽  
pp. 131
Author(s):  
Timothy K. Broschat
Keyword(s):  
Root Growth ◽  
Growth Rates ◽  
Shoot Growth ◽  
Cocos Nucifera ◽  
Primary Root ◽  
The Other ◽  
Date Palms ◽  
Primary Roots ◽  
Root And Shoot Growth ◽  
Soil Temperatures

Royal palms [Roystonea regia (HBK.) O.F. Cook], coconut palms (Cocos nucifera L. `Malayan Dwarf'), queen palms [Syagrus romanzoffiana (Chamisso) Glassman], and pygmy date palms (Phoenix roebelenii O'Brien) were grown in a rhizotron to determine the patterns of root and shoot growth over a 2-year period. Roots and shoots of all four species of palms grew throughout the year, but both root and shoot growth rates were positively correlated with air and soil temperature for all but the pygmy date palms. Growth of primary roots in all four species was finite for these juvenile palms and lasted for only 5 weeks in royal palms, but ≈7 weeks in the other three species. Elongation of secondary roots lasted for only 9 weeks for coconut palms and less than half of that time for the other three species. Primary root growth rate varied from 16 mm·week-1 for coconut and pygmy date palms to 31 mm·week-1 for royal palms, while secondary root growth rates were close to 10 mm·week-1 for all species. About 25% of the total number of primary roots in these palms grew in contact with the rhizotron window, allowing the prediction of the total root number and length from the sample of roots visible in the rhizotron. Results indicated that there is no obvious season when palms should not be transplanted in southern Florida because of root inactivity.

scholarly journals Aspects of cultivar variation in physiological traits related to Cd distribution in rice plants with a short-term stress

2020 ◽  
Author(s):  
Wan-Ting Chiao ◽  
Bo-Ching Chen ◽  
Chien-Hui Syu ◽  
Kai-Wei Juang
Keyword(s):  
Shoot Growth ◽  
Rice Grain ◽  
Rice Cultivars ◽  
Cd Accumulation ◽  
Physiological Regulation ◽  
Rice Plants ◽  
Cd Contamination ◽  
Cultivar Variation ◽  
Cd Distribution ◽  
Cd Translocation

Abstract Background Genotypic variations are seen in cadmium (Cd) tolerance and accumulation in rice plants. Cultivars that show low Cd translocation from the root into shoot can be selected to reduce Cd contamination in rice grains. This study aims to clarify the physiological regulation related to Cd absorption by rice plants for screening out the cultivars, which have relatively low Cd accumulation in grains. Eight Taiwan mega cultivars of paddy rice: japonica (TY3, TK9, TNG71, and KH145 cultivars), indica (TCS10 and TCS17 cultivars), and glutinous (TKW1 and TKW3 cultivars), which are qualified with the criteria for rice grain quality by the Council of Agriculture, Taiwan, were used for illustration. An experiment in hydroponics was conducted for the rice seedlings with a treatment of 50 μM CdCl 2 for 7 days. Results and discussion After the Cd treatment, the reductions in shoot growth were more significant than those in root growth; however, Cd absorbed in the rice plant was sequestered much more in the root. The malondialdehyde (MDA) was preferentially accumulated in rice root but the hydrogen peroxide (H 2 O 2 ) was increased more significantly in the shoot; the antioxidative enzymes, superoxide dismutase (SOD) and ascorbate peroxidase (APX), were pronounced more in rice shoot. Conclusions The rice cultivars preferentially accumulated Cd in the root rather than the shoot with the Cd treatment, which resulted in significant enhancements of MDA and growth reductions in the root. However, H 2 O 2 accumulation was toward the shoot to retard shoot growth suddenly and then the root could keep a gradual growth. Also, the rice cultivars, which preferentially accumulate Cd in the root, would have the regulation tendency of SOD toward the shoot. Due to that SOD is responsible for H 2 O 2 production, H 2 O 2 accumulation would be thus toward the shoot. Moreover, the cultivars, which have a less regulation tendency of APX toward the shoot, would present higher translocation of Cd into the shoot.

scholarly journals A Method for Measuring Bleeding Rates of Primary Roots in Rice Plants

1988 ◽  
Vol 57 (1) ◽  
pp. 246-247
Author(s):  
Koou YAMAZAKI ◽  
Jun ABE
Keyword(s):  
Rice Plants ◽  
Primary Roots

scholarly journals Aspects of cultivar variation in physiological traits related to Cd distribution in rice plants with a short-term stress

2020 ◽  
Author(s):  
Wan-Ting Chiao ◽  
Bo-Ching Chen ◽  
Chien-Hui Syu ◽  
Kai-Wei Juang
Keyword(s):  
Shoot Growth ◽  
Rice Grain ◽  
Rice Cultivars ◽  
Cd Accumulation ◽  
Physiological Regulation ◽  
Rice Plants ◽  
Cd Contamination ◽  
Cultivar Variation ◽  
Cd Distribution ◽  
Cd Translocation

Abstract Background Genotypic variations are seen in Cd tolerance and accumulation in rice plants. Cultivars that show low Cd translocation from the root into shoot can be selected to reduce Cd contamination in rice grains. This study aims to clarify the physiological regulation related to cadmium (Cd) absorption by rice plants for screening out the cultivars, which have relatively low Cd accumulation in grains. Eight Taiwan mega cultivars of paddy rice: japonica (TY3, TK9, TNG71, and KH145 cultivars), indica (TCS10 and TCS17 cultivars), and glutinous (TKW1 and TKW3 cultivars), which are qualified with the criteria for rice grain quality by the Council of Agriculture, Taiwan, were used for illustration. An experiment in hydroponics was conducted for the rice seedlings with a treatment of 50 µM CdCl2 for 7 days. Results and discussion After the Cd treatment, the reductions in shoot growth were more significant than those in root growth; however, Cd absorbed in the rice plant was sequestered much more in the root. The malondialdehyde (MDA) was preferentially accumulated in rice root but the hydrogen peroxide (H2O2) was increased more significantly in the shoot; the antioxidative enzymes, superoxide dismutase (SOD) and ascorbate peroxidase (APX), were pronounced more in rice shoot. Conclusions The rice cultivars preferentially accumulated Cd in the root rather than the shoot with the Cd treatment, which resulted in significant enhancements of MDA and growth reductions in the root. However, H2O2 accumulation was toward the shoot to retard shoot growth suddenly and then the root could keep a gradual growth. Also, the rice cultivars, which preferentially accumulate Cd in the root, would have the regulation tendency of SOD toward the shoot. Due to that SOD is responsible for H2O2 production, H2O2 accumulation would be thus toward the shoot. Also, the cultivars, which have a less regulation tendency of APX toward the shoot, would present higher translocation of Cd into the shoot.

scholarly journals Salt Modulates Gravity Signaling Pathway to Regulate Growth Direction of Primary Roots in Arabidopsis

2007 ◽  
Vol 146 (1) ◽  
pp. 178-188 ◽  
Author(s):  
Feifei Sun ◽  
Wensheng Zhang ◽  
Haizhou Hu ◽  
Bao Li ◽  
Youning Wang ◽  
...  
Keyword(s):  
Signaling Pathway ◽  
Growth Direction ◽  
Primary Roots

scholarly journals A nonparametric test on differences in growth direction of rice primary roots.

1990 ◽  
Vol 59 (3) ◽  
pp. 572-575 ◽  
Author(s):  
Jun ABE ◽  
Keisuke NEMOTO ◽  
Dong Xu HU ◽  
Shigenori MORlTA
Keyword(s):  
Nonparametric Test ◽  
Growth Direction ◽  
Primary Roots

scholarly journals Aspects of cultivar variation in physiological traits related to Cd distribution in rice plants with a short-term stress

2020 ◽  
Vol 61 (1) ◽  
Author(s):  
Wan-Ting Chiao ◽  
Bo-Ching Chen ◽  
Chien-Hui Syu ◽  
Kai-Wei Juang
Keyword(s):  
Shoot Growth ◽  
Rice Grain ◽  
Rice Cultivars ◽  
Cd Accumulation ◽  
Physiological Regulation ◽  
Rice Plants ◽  
Cd Contamination ◽  
Cultivar Variation ◽  
Cd Distribution ◽  
Cd Translocation

Abstract Background Genotypic variations are seen in cadmium (Cd) tolerance and accumulation in rice plants. Cultivars that show low Cd translocation from the root into shoot can be selected to reduce Cd contamination in rice grains. This study aims to clarify the physiological regulation related to Cd absorption by rice plants for screening out the cultivars, which have relatively low Cd accumulation in grains. Eight Taiwan mega cultivars of paddy rice: japonica (TY3, TK9, TNG71, and KH145 cultivars), indica (TCS10 and TCS17 cultivars), and glutinous (TKW1 and TKW3 cultivars), which are qualified with the criteria for rice grain quality by the Council of Agriculture, Taiwan, were used for illustration. An experiment in hydroponics was conducted for the rice seedlings with a treatment of 50 μM CdCl2 for 7 days. Results and discussion After the Cd treatment, the reductions in shoot growth were more significant than those in root growth; however, Cd absorbed in the rice plant was sequestered much more in the root. The malondialdehyde (MDA) was preferentially accumulated in rice root but the hydrogen peroxide (H2O2) was increased more significantly in the shoot; the antioxidative enzymes, superoxide dismutase (SOD) and ascorbate peroxidase (APX), were pronounced more in rice shoot. Conclusions The rice cultivars preferentially accumulated Cd in the root rather than the shoot with the Cd treatment, which resulted in significant enhancements of MDA and growth reductions in the root. However, H2O2 accumulation was toward the shoot to retard shoot growth suddenly and then the root could keep a gradual growth. Also, the rice cultivars, which preferentially accumulate Cd in the root, would have the regulation tendency of SOD toward the shoot. Due to that SOD is responsible for H2O2 production, H2O2 accumulation would be thus toward the shoot. Moreover, the cultivars, which have a less regulation tendency of APX toward the shoot, would present higher translocation of Cd into the shoot.

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