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A two year experiment was carried out in newly reclaimed soils (sandy soils) to investigate the effect of cutting and phosphorus and potassium fertilization on the growth, yield, seed mucilage content and seed protein content of guar plant. The results revealed that different cutting treatments significantly decreased the plant weight, seed yield, seed mucilage content and seed protein content. Phosphorus fertilization up to 350 kg super-phosphate (15% P2O5)/feddan* significantly increased plant weight, seed yield, seed mucilage content and seed protein content. Fertilization with 150 kg potassium sulfate (48% K2O)/feddan was quite capable to meet guar plant potassium demands in this kind of soil. Without cutting plants, fertilization with 350 kg super-phosphate and 150 kg potassium sulfate/feddan resulted in the highest seed yield, seed muculage content and seed protein content.

A B S T R A C T Proteolytic enzymes

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Silymarin, synthesized in fruits of Silybum marianum (L.) Gaertn., is a mixture of the three flavonolignans silibinin, silydianin, and silychristin. In the past, silymarin has been used for therapy of hver diseases, but clinical investigations have demonstrated that silibinin is the effective compound (1). Therefore, plant breeding should aim for a genotype with silibinin as its only flavonolignan. Successful selection strategies require basic knowledge of pollination and fertilization mechanisms in Silybum.Greenhouse experiments indicated that S. marianum is a self-fertile species. Even when the anthers with sepals were removed directly after flower elongation a seed set of 35% was observed (2).In order to obtain data on outcrossing ratio under natural conditions, a field experiment was carried out in summer 1992. Three inbred generations (11-13) of the genotype S 26 (with the recessive character "green leaves") and plants of the genotype S 22 (with the dominant character "variegated leaves") were used (3). The monogenic character of the leaf colour allowed early detection of F3-plants derived from cross-pollination. Three plants from each inbred generation of S 26 were transferred to the field and 30 plants of 5 22 were cultivated around the S 26 plants, to enable cross-poffination by insects.Table 1 Ratios of seedlings with green and variegated leaves in the F1-generation. Generation lnflorescence Number of fruits Seedlings with green leaves Seedlings with varieg. leaves Outcrossing ratio F1aofl1b 1+2. 450 379 4 1.06c F1of13 1+2. 450 369 9 2.44 F1 of 13 1+2. 450 359 10 2.79 1 1350 1107 23 2.04 a Generation after the outcrossing experiment. lnhred generation. Values in %.From every plant of each generation, 100 fruits from the first and 50 fruits from the second inflorescence of S 26 were harvested and subsequently the seedlings with green and variegated leaves were counted in the F1 (Table 1).Autogamy was predominant in all inbred generations, but partial xenogamy was also observed. The ratio of outcrossing ranged from 1.06-2.79%, with an average ratio of 2.04These results indicate that S. marianum is a selffertile species with a low outcrossing ratio. This is in con-tradiction to the report by Heinz (4), whobased on morphological studies -communicated that flowers of S. marianum show protandry. After evaluation of five inbred generations she observed inbred-depressions and concluded that S. mananum is an outcrossing species.

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