By Boughton Cobb; Elizabeth Farnsworth; Cheryl Lowe
A learn of infinity in all its kinds and its implications for the human brain. in the realm of "Mindscape", a part of a universe, the e-book exhibits that arithmetic, technological know-how, and good judgment merge with the glorious, and rather a lot is published concerning the powers of the brain and its barriers offers a finished box advisor to the ferns of northeastern and important North the US, and comprises colour photos and full-page line drawings. half One. lifestyles cycle of a fern -- where of ferns and fern kin within the plant country -- Fern habitats and conservation -- Morphology of a fern -- the way to use this box advisor -- Key to genera of Northeastern and important North American ferns and comparable species -- half . actual ferns -- half 3. Fern relations -- half 4. Ferns in cultivation and tradition
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Extra resources for A field guide to ferns and their related families : northeastern and central North America
Sample text
These cells are distinctively thin with many vacuoles and light-colored cytoplasm. By the binucleate stage, the pollen cells are completely aborted with complete vacuolization and withering of the intercellular cells. At this point the secondary tapetal walls in the intercellular cells can be easily observed under the microscope (Pan 1979; Pan and He 1981a,b). The tapetal and endothecial abnormalities are also the main 2. HYBRID RICE: GENETICS, BREEDING, AND SEED PRODUCTION 37 histological causes of male sterility in 'V20A' and 'Pragathi A' (Yogeesha and Mahadevappa 1995).
Abnormality of the Intercellular and Tapetal Cells. The tapetal cells encircle sporogeneous cells and provide nourishment to the reproductive cells. Abnormal development or damage of intercellular or tapetal cells often results in the pollen abortion of rice male sterile lines (Rao 1988). Excessive proliferation of tapetal cells in HL-type 'Hua-Ai 15 A' causes tapetal periplasmodia to form, pushing the pollen mother cells to the center of the anther, which results in the dissolution of the pollen mother cells.
Guangxi Academy of Agricultural Sciences in China found that wall thickness between the 1st to the 6th internode of the hybrid 'Shan-You 2' was much greater than that of 'Bao-Xuan 3'. Thus, the hybrid rice has higher lodging resistance even though its plants are taller than their parents (Yuan and Chen 1988). J. LI AND L. YUAN 26 Greater Leaf Area. The leaf area per plant of the hybrid 'Nan You 2' at heading and maturity were 6914 cm 2 and 4124 cm 2 , respectively, compared with 4354 cm 2 and 2285 cm 2 for the male parent 'IR24' (Li et al.