جستجوی مقالات مرتبط با کلیدواژه « منبع گرده » در نشریات گروه « کشاورزی »

Pollen flow in anemophilous plants is a dynamic process. This controlled by wind speed, turbulence direction and depends on, plantation map, rate of air humidity, male genotype and female cultivar biological characteristics. The aims of this research were to survey and analysis pollen dispersal model in distance from few male genotypes within a block of Shahpasand and Akbari pistachio cultivars.

The lams coated with thin layer of Vaseline gel were installed on piece of wood tied on top of wooden bars. The bars had a distance of 7 m to each other as distance of female trees. . The lams were installed horizontally and vertically on bars which had planted beside female tress from a distance of 8 to 64m in Shahpasand and 80 m in Akbari plot. Every lam was installed on woody bar from 8 am to 8 am of next day and number of pollen was counted on horizontal and vertical lam via a light microscope. Data were analyzed using RCD and regression analysis, as Y is accounted as pollen intensity and X as distance to pollinizer.

Results indicated the pollen intensity was declined after 35 m distance from male genotypes. Further, fruit set also indicated a decreasing trend as distance had been increased from male genotypes. However, the intensity of pollen was differed on different day. This was due to some differences appeared by wind speed and direction. The best wind speed on 2 M height from the ground was 10 km/h equal to 2.7 m/s. On days when the speed of winds was raised to more than 30 km there were no traces of pollens dispersal on lams and dusts were replaced. The maximum intensity of pollen in Akbari plot was found in distance between 20 to 30 m from male trees. The recent results indicated a sinusoidal model. There was no found significant differences in fruit set percentage by open pollination and by controlled pollination by hand in Shahpasnand plot. Even though the intensity of pollen was reduced in 40 m distance from male tree but this condition had no effect on rate of fruit set percentage in Shahpasand plot.

Within this research it was cleared that pollen intensity in both plots of Shahpasand and Akbari female trees was influenced by wind speed, wind direction and frequency of male trees. Intensity of pollen was reduced by 40 m from pollen source in both plots of Shahpasanand and Akbari. There was no reduction in fruit set at Shahpasand by 60 m distance from the male tree. It is suggested plantation of few male tree in the row for 3 of 4 rows of female pistachio trees would be more beneficial for orchardist

In order to the evaluation of the effects of Canary Island palm pollen on the fruit characteristics of commercial date palms cvs ‘Medjool’ and ‘Barhee’ and the possibility of use of the pollen of this specie for date palm pollination, the current study was conducted for two consecutive years in Date palm and Tropical fruits Research Center. The research was conducted as two separate experiments in a randomized complete block design with three treatments of pollen type (Canary Island palm including ‘G1’ and ‘G2’ and date palm cv ‘Red Ghanami’ as control) and three replications (18 trees that were 15 years old). Each palm has considered as an experiment unit. Results showed, traits of percentage of fruit set, parthenocarpy, and fruit drop in ‘Barhee’ cultivar were not affected by pollen source and no significant difference was obsereved between Canary Island palm pollinizers and ‘Red Ghanami’ pollinizer regarding these traits, but these traits were affected by pollen source in ‘Medjool’ cultivar. Canary Island palm pollinizers reduced seed weight, seed length and seed diameter of ‘Barhee’ cultivar significantly. While seed characteristics of ‘Medjool’ cultivar were not affected by Canary Island palm pollens. Qualitative characteristics of ‘Medjool’ and ‘Barhee’ fruits were also affected by Canary Island palm pollens. Overall, at the conditions of date palm pollen deficiency, the use of Canary Island palm pollens (3 g per spathe) for the pollination of ‘Barhee’ cultivar is recommended and for other cultivars more research is needed.

Date palm is one of the most important horticultural crops in Iran. The yield and fruit quality of this crop depend on several factors especially the pollen source. In order to determine the effect of pollen source on quantitative and qualitative characteristics of fruit of tissue cultured "Zahedi" date palm, the experiment was carried out as factorial based on randomized complete block design with three male genotypes (M001, M002 and M003) and three stages of fruit growth (Khalal, Rutab and Tamar). Some quantitative and qualitative characteristics of fruit were studied at the fruit growth stages. Results showed that fruit length, diameter, and fresh weight as well as pH, TA, TSS, TSS/TA, total sugar content, and yield are affected by the type of pollen. It was found that fruit and seed size and volume and fruit TA were decreased while fruit TSS, pH, TSS/TA and total sugar content were significantly increased toward Tamar stage. It was found that M001 compared to other studied male genotypes improved the quantitative and qualitative characteristics of fruit and increased the yield (28.9 kg) of "Zahedi" cultivar.