1Received for publication May 23, 1981.
The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.
2This work was partially supported by Marks & Spencer Ltd., Great Britain.
3Department of Field Crops and Vegetables, Faculty of Agriculture, The Hebrew University of Jerusalem.
4Applied Research Institute and Department of Biology, Ben-Gurion University of the Negev.
5The authors would like to thank Pnina Golan and Shlomit Mark for their skillful technical assistance and Dorot Imber and Inez Mureinik for editing the manuscript.
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