摘要:

Cuttings of dormantLonicera tartarica, collected in March, were treated with a factorial series of indolylacetic acid and nutrient solutions. Indolylacetic acid was used at dosages of 0, 10, 50, and 100 p.p.m. in conjunction with 0, 1, and 10 concentrations of a modified Hoagland's nutrient solution. Indolylacetic acid treatment significantly increased the percentage of rooting, and the number and total length of roots, the fresh root weight and the green weight of leaf per group of cuttings treated, the higher concentrations having the greater effect. The use of nutrient also significantly affected each of the foregoing characters. The results suggest that some dormant cuttings may be deficient in minerals essential for rooting, and that there is an optimum nutrient concentration somewhere below the highest used in this experiment.

ISSN:1923-4287    

DOI:10.1139/cjr39c-031

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

Cuttings of two herbaceous and two dormant woody plants were treated with a factorial series of talc dusts containing cane sugar, ethyl mercuric phosphate and indolylacetic acid. The effect of the dusts on cuttings ofColeus BlumeiandIresine Lindeniwas determined by the number of roots per rooted cutting, the length of root mass and dry weight of roots. Each of the three factors gave at least one significant effect with both plants.Iresine Lindenicuttings showed two significant interactions, one between organic mercury and indolylacetic acid on the number of roots per rooted cutting, the other between sugar and indolylacetic acid on the length of root mass. DormantLonicera tartaricacuttings showed significant effects from indolylacetic acid on the number of cuttings rooted, the number and length of roots per rooted cutting, the mean root length, and fresh root weights. Green leaf weights of this plant were significantly affected by sugar, and the sugar × organic mercury, and sugar × organic mercury × indolylacetic acid interactions. Fresh root weights also gave a significant triple interaction. The number ofPhysocarpus opulifoliuscuttings rooted was significantly increased by organic mercury as were the dry root weights. Root weights also were affected by sugar treatment. This plant failed to make any significant response to indolylacetic acid treatment.The results indicate that cane sugar and ethyl mercuric phosphate, as well as indolylacetic acid, affect some of the rooting responses of plant cuttings. It is suggested that the dust method of treating cuttings may be used to supply factors, other than the recognized growth stimulating chemicals, that are advantageous to successful vegetative propagation of plants.

ISSN:1923-4287    

DOI:10.1139/cjr39c-032

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

Cuttings of dormantLonicera tartarica, collected in March, were treated with a factorial series of indolylacetic acid and cane sugar solutions. Indolylacetic acid was used at concentrations of 0, 10, 50, and 100 p.p.m., while cane sugar was present at 0, 1, 5, and 10%. Indolylacetic acid treatment greatly increased the percentage of cuttings rooted, the number and length of roots per rooted cutting, the fresh root weight and the green weight of leaf produced. Cane sugar treatment alone or in combination with indolylacetic acid failed to show any significant effects, suggesting that dormant cuttings of this plant have an adequate reserve of carbohydrate material.Apart from a somewhat greater effect of treatment on the percentage of rooting, the results are in essential agreement with those previously secured from dormant October cuttings. In comparison with a parallel experiment on the dusting of March cuttings propagated in the same frame, solution treatment had the greater effect on all the responses considered except green weight of leaf produced, which was greater following dusting.

ISSN:1923-4287    

DOI:10.1139/cjr39c-033

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

The complete development of the growing tip of the lateral fruit spur of the Wagener apple, from the time of its initiation until it produces mature fruit, requires four seasons. These are referred to as years I, II, III, and IV. The development during years I, II, and III may be divided into six typical phases. The growth during each of these phases is characteristic and different from that of any other stage. The phase just before initiation of the flower extends through June and the first half of July of year III ("off"). During this period the crown broadens and flattens, the pro-meristematic tissue becomes shallow, the scale and leaf primordium bases remain level with the crown and the pro-vascular strands and pith become broadly hemispherical. This phase is followed by flower formation, which is initiated during the last part of July, by the triangular, horizontal, upper surface of the crown becoming circular and developing five sepal primordia for the terminal flower. The flower cluster as a whole is "determinate", but its lateral flowers are axillary in origin and appear in acropetal succession. It is suggested that the changes occurring in the tip of the "off" spur during June, namely, the broadening and flattening of the crown, etc., may be an indication that physiological differentiation of the crown into flower-forming tissue is taking place.

ISSN:1923-4287    

DOI:10.1139/cjr39c-034

出版商:NRC Research Press    

年代:1939

数据来源: NRC