No abstract

Experiments were performed to determine the effects of simulated acid rain on Phaseolus vulgaris L. At pH values below 3, plants exhibited a failure to attain normal height, had necrotic and wrinkled leaves, excessive and adventitious budding, and premature abscission of primary leaves. Histologically, leaves had smaller cells, less intercellular space, and smaller starch granules within the chloroplasts. Respiration rates of the treated plants increased only slightly at low pH values. Apparent rates of photosynthesis, however, increased dramatically. Both carbohydrate production and root biomass were reduced by low pH treatments, and application of Congo red indicator to the acid‐treated leaf tissue showed that the cell contents were acidified to a pH of below 4.0.

No abstract

Cover photo: An aerial view of Fenton Hill geothermal site, looking south toward Albuquerque. An Affirmative ActwnlEqual %tunity Employer 30 NOT M I C R O~I L~ COVER This report ums prepared as an account of work sponsored by an agency of the United Stafes Guvernment. Neither The Regents of the Unimity of California, the United States Government w any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibilityfor the accuracy, completeness, OT usefulness of any information, apparatus, product, or process disclosed, or represents that its use mould not infringe primtely owned rights. Reference herein to any specific commercial product, process, or seroice by trade name, trademark, manufacturer, or otherwise, does not n e e y i i amstitute or imply its endorsement, recommendation, or fnwring by The Regents ofthe Unmemty of Gdijbmia, the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or refed those of The Regents of the University of Gdifornia, the United States Govenrment or any agency thereof.

In 1979, soil am. vegetation samples were collected on Sigma ..-&a to provide background data before construction on the mesa. Elemental data are presented for soil, grass, juniper, piiion pine, and oak. None of the data looks out of the ordinary. DJSTRfBUTiON OF THIS DOCUMENT is UNtlMITa 150 68 3