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Science 5 January 2007:
Vol. 315. no. 5808, p. 14
DOI: 10.1126/science.315.5808.14i
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This Week in Science

Figure 1 The nodulation of roots in legumes is a key factor in nitrogen fixation. Working in the leguminous plant Lotus japonica, Trichine et al. (p. 104, published online 16 November) and Murray et al. (p. 101, published online 16 November) have identified how the hormone cytokinin fits into the signaling cascade by which leguminous plants establish nitrogen-fixation nodules filled with symbiotic bacteria (see the Perspective by Oldroyd). Gain-of-function mutation in a cytokinin receptor results in spontaneous formation of bacteria-free nodules, whereas loss of function results in too few nodules, despite aggressive formation of bacterial infection threads.

CREDIT: K. SZCZYGLOWSKI AND A. MOLNAR/AGRICULTURE AND AGRI-FOOD CANADA




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Science. ISSN 0036-8075 (print), 1095-9203 (online)