scholarly journals Growth Dependent Changes of Endogenous Ethylene Levels in Leaf Sheaths and Panicles in the Life Cycle of Rice Plants.

1991 ◽  
Vol 60 (2) ◽  
pp. 306-311 ◽  
Author(s):  
Hiroyasu MICHIYAMA ◽  
Hitoshi SAKA
Keyword(s):  
Life Cycle ◽  
Rice Plants ◽  
Endogenous Ethylene

Fate and Transformation of CuO Nanoparticles in the Soil–Rice System during the Life Cycle of Rice Plants

2017 ◽  
Vol 51 (9) ◽  
pp. 4907-4917 ◽  
Author(s):  
Cheng Peng ◽  
Chen Xu ◽  
Qinglin Liu ◽  
Lijuan Sun ◽  
Yongming Luo ◽  
...  
Keyword(s):  
Life Cycle ◽  
Cuo Nanoparticles ◽  
Rice Plants

Changes in release level of momilactone B into the environment from rice throughout its life cycle

2003 ◽  
Vol 30 (9) ◽  
pp. 995 ◽  
Author(s):  
Hisashi Kato-Noguchi ◽  
Takeshi Ino ◽  
Masahiko Ichii
Keyword(s):  
Life Cycle ◽  
Release Rate ◽  
Rice Plant ◽  
Growth Inhibitor ◽  
Rice Plants ◽  
Flowering Initiation ◽  
Single Rice ◽  
Germination And Growth

Momilactone B was released into the neighboring environment from rice throughout its life cycle. The rate of momilactone B release from rice increased until flowering initiation, and then decreased. The release rate of momilactone B at the day of flowering started was 2.1 μg plant–1 d–1. On average, a single rice plant released about 100 μg of momilactone B into the neighboring environment over its life cycle. Since momilactone B is a growth inhibitor, these results suggest that momilactone B released from rice plants may serve as an allelochemical to inhibit the germination and growth of neighboring plants.

Dynamic influence of S fertilizer on Cu bioavailability in rice (Oryza sativa L.) rhizosphere soil during the whole life cycle of rice plants

2018 ◽  
Vol 19 (1) ◽  
pp. 198-210 ◽  
Author(s):  
Lijuan Sun ◽  
Qinglin Liu ◽  
Yong Xue ◽  
Chen Xu ◽  
Cheng Peng ◽  
...  
Keyword(s):  
Oryza Sativa ◽  
Life Cycle ◽  
Rhizosphere Soil ◽  
Oryza Sativa L ◽  
Rice Plants ◽  
Whole Life Cycle ◽  
Cu Bioavailability

scholarly journals Biological of black bug Paraeuscosmetus pallicornis (Hemiptera: Lygaeidae) on two varieties of rice plants at laboratory

1970 ◽  
Vol 5 (2) ◽  
pp. 229-236
Author(s):  
Nurhabibah ◽  
Cyccu Tobing ◽  
Hasanuddin
Keyword(s):  
Life Cycle ◽  
Rice Plants ◽  
Randomized Design ◽  
Plant Pest ◽  
Agricultural Faculty ◽  
Descriptive Method ◽  
Total Life

The objective of the research was to study the biology of black bug Paraecosmitus palicornis insects on two varieties of rice at laboratory. The research was conducted at Plant Pest Laboratory of Agricultural Faculty University of Sumatera Utara, Medan from September to December 2017. The research used by descriptive method and complete randomized design with nine replications. The results showed that total life cycle on Mekongga varieties was ±27.1 days and a female laids ±41.56 eggs. Total life cycle on Mapan 05 varieties was ±26.2 days and female laids ± 12,55 eggs.

scholarly journals Biologi dan statistik demografi kutudaun Rhopalosiphum rufiabdominale (Sasaki) dan Tetraneura nigriabdominalis (Sasaki) (Hemiptera: Aphididae) di akar padi

2020 ◽  
Vol 16 (3) ◽  
pp. 180
Author(s):  
Purnama Hidayat ◽  
Harleni Harleni ◽  
Yani Maharani ◽  
Hermanu Triwidodo
Keyword(s):  
Growth Rate ◽  
Life Cycle ◽  
Doubling Time ◽  
Demographic Variable ◽  
Aphid Species ◽  
Intrinsic Growth Rate ◽  
Statistical Parameters ◽  
Rice Plants ◽  
Rice Roots ◽  
Important Pest

<p><em>Rhopalosiphum </em><em>rufiabdominale</em> (Sasaki) and <em>Tetraneura nigriabdominalis</em> (Sasaki) are aphid species found in the roots of rice plants. Information about the host range and biology of <em>R. </em><em>rufiabdominale</em> is relatively known than <em>T. nigriabdominalis</em>. This study aims to determine the biology and demographic statistics of <em>R. </em><em>rufiabdominale</em> and <em>T. nigriabdominalis</em> in the roots of rice plants. The aphids obtained from lowland rice roots in Leuwiliang, Bogor Regency were maintained and reared in Ciherang variety rice roots in the laboratory. Each individual of the 1st instar aphid nymph in the same cohort was infested into the roots of rice in 60 plastic containers for biological observations and statistical demographic variable data collection. Survivorship (l<sub>x</sub>), fecundity (m<sub>x</sub>), and the average number of nymphs born by adult every day at age (x) are used to calculate demographic statistical parameters. The results showed that the two species of the aphids have 4 nymph instars. Life cycle and longevity of <em>R. </em><em>rufiabdominale</em> were 4.98 days and 15.94 days with fecundity of 67.44 respectively, whereas the life cycle and longevity of <em>T. nigriabdominalis </em>were 5.25 days and 18.11 days with fecundity of 11.11 respectively. <em>R. </em><em>rufiabdominale</em> aphids have an intrinsic growth rate (r) of 0.46 days and a doubling time (DT) of 1.50 days, whereas <em>T. nigriabdominalis</em> has an intrinsic growth rate of 0.14 days and a doubling time of 4.99 days. The results of this study indicate that although the life cycle lengths of the two species are almost the same, the population of <em>R. </em><em>rufiabdominale</em> develops 3.5 times faster than <em>T. nigriabdominalis</em> and therefore <em>R. </em><em>rufiabdominale</em> has the potential to become an more important pest in rice plants.</p>

Ultrastructural analysis of “Sensory” surface nerve endings and “putative” neurotransmitter sites in Schistosoma mansoni Miracidia

1989 ◽  
Vol 47 ◽  
pp. 962-963
Author(s):  
Betty Ruth Jones ◽  
Steve Chi-Tang Pan
Keyword(s):  
Nervous System ◽  
Life Cycle ◽  
Schistosoma Mansoni ◽  
Snail Host ◽  
Complex Life Cycle ◽  
Rational Approach ◽  
Effective Control ◽  
The Social ◽  
Social And Economic Development ◽  
Basic Biology

INTRODUCTION: Schistosomiasis has been described as “one of the most devastating diseases of mankind, second only to malaria in its deleterious effects on the social and economic development of populations in many warm areas of the world.” The disease is worldwide and is probably spreading faster and becoming more intense than the overall research efforts designed to provide the basis for countering it. Moreover, there are indications that the development of water resources and the demands for increasing cultivation and food in developing countries may prevent adequate control of the disease and thus the number of infections are increasing.Our knowledge of the basic biology of the parasites causing the disease is far from adequate. Such knowledge is essential if we are to develop a rational approach to the effective control of human schistosomiasis. The miracidium is the first infective stage in the complex life cycle of schistosomes. The future of the entire life cycle depends on the capacity and ability of this organism to locate and enter a suitable snail host for further development, Little is known about the nervous system of the miracidium of Schistosoma mansoni and of other trematodes. Studies indicate that miracidia contain a well developed and complex nervous system that may aid the larvae in locating and entering a susceptible snail host (Wilson, 1970; Brooker, 1972; Chernin, 1974; Pan, 1980; Mehlhorn, 1988; and Jones, 1987-1988).

A freeze-fracture-etched study of the physarum polycephalum plasma membrane during early formation of the macroplasmodial stage

1993 ◽  
Vol 51 ◽  
pp. 346-347
Author(s):  
Randolph W. Taylor ◽  
Henrie Treadwell
Keyword(s):  
Plasma Membrane ◽  
Life Cycle ◽  
Growth Phase ◽  
Filter Paper ◽  
Physarum Polycephalum ◽  
Freeze Fracture ◽  
Petri Dish ◽  
Wire Screen ◽  
Wide Mouth ◽  
Sterile Filter

The plasma membrane of the Slime Mold, Physarum polycephalum, process unique morphological distinctions at different stages of the life cycle. Investigations of the plasma membrane of P. polycephalum, particularly, the arrangements of the intramembranous particles has provided useful information concerning possible changes occurring in higher organisms. In this report Freeze-fracture-etched techniques were used to investigate 3 hours post-fusion of the macroplasmodia stage of the P. polycephalum plasma membrane.Microplasmodia of Physarum polycephalum (M3C), axenically maintained, were collected in mid-expotential growth phase by centrifugation. Aliquots of microplasmodia were spread in 3 cm circles with a wide mouth pipette onto sterile filter paper which was supported on a wire screen contained in a petri dish. The cells were starved for 2 hrs at 24°C. After starvation, the cells were feed semidefined medium supplemented with hemin and incubated at 24°C. Three hours after incubation, samples were collected randomly from the petri plates, placed in plancettes and frozen with a propane-nitrogen jet freezer.

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