Lettuce seedling

C. C. Young and L. F. Chen, Polyaniines in humic acid and their effect on radical growth of lettuce seedlings. Plant Soil 795 143 (1997). 

Figure 1. Mean root length in mm of lettuce seedlings at various concentrations of Acroptilin.

The other two assays used tomato cell cultures or lettuce seedling root growth. The most active allelopathic... 

Figure 6. Affects of polar peak IB on root growth of lettuce seedling following three day treatments.

Table IV. Effects of 250 Nonpolar Peaks from Axenic ppmw Murashige and Skoog Cultures of Spikerush on Root Growth Medium, Polar and Lettuce Seedling...

Internalization of E. coli 0157 H7 within lettuce seedlings cultivated in soil or hydroponically No surface sterilization Confocal microscopy to detect gfp label Wachtel et al. (2002)... 

Three metabolites, Cyl-1, Cyl-2, Cyl-3, were found in the culture filtrate of Cylindrocladium scoparium (181, 182). Cyl-1 and Cyl-2 showed inhibition of root growth, whereas Cyl-3 promoted the growth of lettuce seedlings. The structure (cyclic peptide) was eluciated only for Cyl-2 (182) as shown in Figure 10. 

Growth inhibition of lettuce seedlings and various species — 249,250... 

Bestwick, L., Bennett, M.H., Mansfield, J.W. and Rossiter, J.T. (1995) Accumulation of the phytoalexin lettucenin A and changes in 3-hydroxy-3-methylglutaryl coenzyme A reductase activity in lettuce seedlings with the red spot disorder. Phytochemistry, 39, 775-7. 

However, in dwarf pea plants and in lettuce seedlings, gibberellic acid (GA2) promotes cell expansion and simultaneously increases XET activity [49a]. The GAj-induced increase in XET is clearly seen if the enzyme activity is expressed per gramme fresh weight. Also, since GA2 increases the fresh weight of treated tissue, it dramatically increases the XET activity per intemode. 

Head lettuce seedlings, for instance, sprayed with 0.01 pm headed 2 weeks earlier than control seedlings sprayed with H2O (50). Potato tubers developed about 3 weeks earlier when plants were treated with O.lppm BR than control plants treated with just water. Plants grown under fertilizer stress seemed to respond most favorably to BR treatment. 

We (Ref. 54) have recently Identified the sesquiterpenes O-caryophyllene (52), 6-cadlmene (57), a-bergamotene (58), 8 blsabolene (53), a-copaene (59), calamenene (60) and 4,10-dlmethyi-7-lsopropylblcyclo[4.4.0]-1,4-decadlene from the steam volatiles of the creeping perennial herb Llppla nodlflora (family Verbenaceae) which Is known for Its rampant growth. Extracts of L. nodlflora reduced lettuce seedling radical length as compared to controls suggesting the presence of allelochemlcals. 

---