Studies on table grape germplasm grown in Northern Greece. I. Maturity time, bunch characteristics and yield

41 local and introduced table grape cultivars of the Greek Gene Bank in Thessaloniki were evaluated and documented with regard to 10 important morphological and viticultural characteristics, e.g. maturity time, bunch form and crop yield from 1991 tb 1993. The data indicate great variation within the grape germplasm in all characters and stress the importance of the genetic material as a donor of valuable genes for further grapevine improvement. Among the earliest cultivars is the Greek newbred Attiki (harvest time: end of July), while the local traditional Sideritis was shown to be the latest maturing cultivar (end of October). Principal Component Analysis (PCA) showed 3 factors representing 69.6% of the total variation. PC1, explaining 40.6% of the total variance, is highly correlated with time of maturity and crop yield. PC2, may be considered as the bunch size factor. The assessed cultivars were classified by cluster analysis into distinct groups, 2 of which contained all early and most of the late season cultivars

Studies on table grape germplasm grown in Northern Greece. 2. Seedlessness, berry and must characteristics

From 1991 to 1993 nine quantitative and qualitative characteristics of the grape berry and its must were evaluated using local and introduced table grape cultivars of the grapevine collection of the Greek Gene Bank. The data indicate a distinct variation in the grape germplasm in all characters and demonstrate the usefulness of the genetic material as a donor of important genes for grapevine improvement. Principal Component Analysis (PCA) produced 2 factors representing 68.1% of the total variation. PC1, explaining 43.6% of the total variance, is highly correlated with berry size parameters and characteristics of the berry structure. By Cluster Analysis the assessed cultivars were separated into distinct groups; while seedlessness, was associated with small berry detachment force from the pedicel, late maturity was combined with high acid and low sugar content and a large number of seeds per berry was accompanied by low sugar content

Wirkung dreier VA-Mykorrhizapilze auf Ertrag und Nährstoffaufnahme von drei Unterlagen und einer Traubensorte

Der Einfluß der VA-Pilzstämme Glomus fasciculatus (M), G. mosseae (M) und G. macrocarpus (M) auf das Sproß- und Wurzeltrockengewicht, auf die Konzentration der Nährstoffe P, K, Ca, Mg, Zn , Mn, Fe und auf die P-Aufnahme in den Trieben dreier Unterlagen und der Tafeltraubensorte Razaki (Syn. Datteltrauben) wurde im Gefäßversuch getestet. Hydroxylapatit wurde als P-Dünger verabreicht. Alle Rebsorten zeigten durch die Beimpfung mit den drei VAM signifikante Ertragserhöhungen, die je nach Sorte und Mykorrhizastamm variierten. Die besten Ergebnisse ergaben sich nach der Beimpfung der Rebsorte Razaki x M3 (MINM Verhältnis 5,0; M: Mykorrhiza, NM: nicht Mykorrhiza), 5 BB x M2 (4,8), 110 R x M2 (3,8) und 41 B x M2 und 41 B x M3 (3,6) . Die Beimpfung bewirkte eine erhöhte P-Konzentration und dadurch eine verbesserte P-Aufnahme. Die Konzentration der Nährstoffe K, Ca, Mg, Zn war bei M- und NM-Pflanzen nicht verschieden. Im Gegensatz dazu war die Konzentration der Mikronährstoffe Mn und Fe in den infizierten Pflanzen seh r stark vermindert (MINM bis zu 0,2).Influence of three VA-mycorrhiza species on the growth and nutrient uptake of three grapevine rootstocks and one table grape cultivarIn a pot experiment the influence of three VA-mycorrhiza species, Glomus fasciculatus, G. mosseae and G. macrocarpus on the shoot and root dry weight, shoot nutrient concentration of P, K, Ca, Mg, Zn, Mn and Fe as well as the total P uptake was studied in three grapevine rootstocks (41 B, 110 R, 5 BB) and cv. Razaki table grape vines (syn. Dattier de Beyrouth). Hydroxyapatite was used as phosphate fertilizer. Considerable responses to mycorrhizal inoculation was observed in both grapevine rootstocks and Razaki vines, according to vine and mycorrhiza species. The inoculated vines showed an increased shoot dry weight; high increase was observed by the inoculation of Razaki vines with G. macrocarpus (M/NM rate 5.0; M: mycorrhiza, NM: non-mycorrhiza), 5 BE rootstock with G. mosseae (M/NM rate 3.8) and 41 B rootstock with G. macrocarpus (M/NM rate 3.6). Mycorrhizal colonization increased the shoot P concentration but did not affect the levels of K, Ca, Mg and Zn. On the contrary the mycorrhizal vines showed a low concentration of Mn and Fe (M/NM down to 0.2)

Forecasting ARMA models: a comparative study of information criteria focusing on MDIC

This paper deals with the implementation of model selection criteria to data generated by ARMA processes. The recently introduced modified divergence information criterion is used and compared with traditional selection criteria like the Akaike information criterion (AIC) and the Schwarz information criterion (SIC). The appropriateness of the selected model is tested for one- and five-step ahead predictions with the use of the normalized mean squared forecast errors (NMSFE)

An Improved Divergence Information Criterion for the Determination of the Order of an AR Process

In this article we propose a modification of the recently introduced divergence information criterion (DIC, Mattheou et al., 2009) for the determination of the order of an autoregressive process and show that it is an asymptotically unbiased estimator of the expected overall discrepancy, a nonnegative quantity that measures the distance between the true unknown model and a fitted approximating model. Further, we use Monte Carlo methods and various data generating processes for small, medium, and large sample sizes in order to explore the capabilities of the new criterion in selecting the optimal order in autoregressive processes and in general in a time series context. The new criterion shows remarkably good results by choosing the correct model more frequently than traditional information criteria

Effect of pacing mode and pacing site on torsional and strain parameters and on coronary flow

Background: Right ventricular apical pacing may induce detrimental effects on left ventricular function and coronary flow. In this study, the effects of pacing site and mode on cardiac mechanics and coronary blood flow were evaluated. Methods: This prospective study included 25 patients who received dual-chamber pacemakers with the ventricular lead placed in the right ventricular apex and presented in sinus rhythm (SR) at their regularly scheduled visits at the pacemaker clinic. Patients underwent complete transthoracic echocardiographic examinations while in SR, followed by noninvasive Doppler assessment of coronary flow in the left anterior descending coronary artery (LAD) and speckle-tracking echocardiography of short-axis planes in SR, atrial pacing (AAI-P), atrioventricular (dual-chamber) pacing (DDD-P), and ventricular pacing (VVI-P). Results: Rotation of the base was significantly decreased with VVI-P compared with AAI-P. Left ventricular twist decreased significantly with DDD-P compared with AAI-P. Circumferential strain of the base significantly decreased with DDD-P and VVI-P compared with SR. The velocity-time integral of diastolic flow in the LAD decreased significantly with DDD-P compared with SR (10.7 ± 2.2 vs 10.2 ± 2.2 vs 8.9 ± 1.6 vs 8.7 ± 2.6 cm in SR and with AAI-P, DDD-P, and VVI-P, respectively, P = .003). Basal rotation and time from onset of the QRS complex to peak basal rotation as a percentage of systole were independently associated with the velocity-time integral of diastolic flow in the LAD during SR and the three pacing modes. Conclusions: Acute right ventricular apical pacing showed a detrimental effect on left ventricular twist and basal mechanics, with the latter being independently associated with decreased LAD diastolic flow velocity parameters. Copyright 2015 by the American Society of Echocardiography