MORPHOLOGICAL RESPONSES OF CROP AND WEED SPECIES OF DIFFERENT GROWTH FORMS TO ULTRAVIOLET-B RADIATION
MORPHOLOGICAL RESPONSES OF CROP AND WEED SPECIES OF DIFFERENT GROWTH FORMS TO ULTRAVIOLET-B RADIATION
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DOI：
10.2307/2444596
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发表时间：
1990-10-01
影响因子：
3
通讯作者：
CALDWELL, MM
中科院分区：
文献类型：
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作者：
BARNES, PW;FLINT, SD;CALDWELL, MM
紫外线-B（UV-B）辐射（280-320纳米）的形态上的12个常见的双子叶植物和单子叶植物作物或杂草物种的影响进行了检查，以确定是否可以找到任何共同的反应，可能，反过来，是有用的，在预测太阳UV-B增强下的竞争平衡的可能变化。在温室条件下，UV-B照射（模拟犹他州洛根平流层臭氧减少20%[美国]）被发现减少叶片和节间长度和增加叶片和腋芽生产在几个物种。总体而言，这些趋势的方向在表现出显著反应的大多数种属中相似。这些形态变化发生在没有任何显着减少总拍摄干物质生产。作物和杂草的反应没有明显的区别，尽管单子叶植物通常比双子叶植物更敏感。先前在密集树冠的工作表明，UV-B的光形态发生效应改变了叶片的位置，从而影响了对光的竞争。我们的研究结果表明，在这些条件下，增加UV-B导致的竞争平衡的变化可能会更频繁地预期时，单子叶植物参与的混合物，而不是只有双子叶植物的混合物。
The influence of ultraviolet-B (UV-B) radiation (280-320 nanometers) on the morphology of 12 common dicot and monocot crop or weed species was examined to determine whether any common responses could be found that might, in turn, be useful in predicting possible changes in competitive balance under solar UV-B enhancement. Under glasshouse conditions, UV-B exposure (simulating a 20% reduction in stratospheric ozone at Logan, Utah [USA]) was found to reduce leaf blade and internode lengths and increase leaf and axillary shoot production in several species. Overall, the directions of these trends were similar in the majority of species that exhibited a significant response. These morphological changes occurred without any significant reduction in total shoot dry matter production. There was no clear distinction in the response of crops and weeds, though monocots were found to be generally more responsive than dicots. Previous work in dense canopies has shown that the photomorphogenetic effects of UV-B alter leaf placement and thereby influence competition for light. Our results suggest that, under these conditions, changes in competitive balance resulting from increased UV-B might be expected more frequently when monocots are involved in mixtures, rather than mixtures of only dicots.