词汇 | stomatal |
释义 | BETA Examples of stomatalstomatal isn’t in the Cambridge Dictionary yet. You can help! This relationship in stomatal density between lower and upper epidermis also held true for shade plants. Rapid initial induction response may be due to less stomatal limitation. Stomatal conductance of lettuce grown under or exposed to different light qualities. Using stomatal aperture-related traits to select for high yield potential in bread wheat. The stomatal density within the bands is 50-55 per mm2. Photosynthetic potential of the shade tolerant species indeed seemed to be constrained by low stomatal conductance under high light. Changes in rates of photosynthesis tended to match changes in stomatal conductance (over the range 0.5 to 3.0 mm s71). The most lightdemanding species showed very little reduction in maximum stomatal conductance under low light, possibly resulting in low water-use efficiency. However, the lower epidermis always had a higher stomatal density in all cases, whether the plants were grown in the sun or in the shade. When leaf and air temperatures were similar, the calculated stomatal conductance was about 1.8 mm s71, close to those measured on shaded leaves. Among the mor phological leaf traits studied, stomatal density, pore diameter and pore depth were not linked consistently to stress tolerance. To what extent can the stress level of the clones be accounted for by stomatal regulation? Photosynthesis and stomatal conductances were affected by drought but in very different ways in each rootstock. Eective stomatal control maintained high relative leaf water contents. About 25% of the chilling eect was shown to be due to reduced stomatal conductance and 75% to impairment of the carboxylation process. In other words, do plants that limit transpiration by having lower stomatal conductance exhibit less negative cleaf ? In contrast, other species did not increase stomatal conductance and photosynthetic rates on the same day (data not shown). For the assessment of stomatal density, nail-varnish impressions of the abaxial surface from one leaf per species were mounted on slides. |
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