Estimation of leaf emergence rates of bananas

Abstract

Leaf emergence rates (LER, leaves/day) of 17 AAA genome banana cultivars (Musa sp., subgroups Gros Michel, Cavendish, Red/Green-red) were estimated using a model based on mean monthly air temperature (13.3-27.9�C), daylength (10.2-13.8 h day), age of planting (48-1361 days), plant density (1111-2222 mats/ha) and cultivar stature (0.88-4.15 m). The LER model involved the five factors in a multiplicative form and was developed initially for one set of 612 observations on all 17 cultivars at Alstonville, N.S.W. but at one density only. The model indicated that LER increased with increasing temperature up to an optimum of c. 28.5�C. LER increased during plant establishment to a maximum at 64 days, then decreased to a stable value with increasing age. LER increased with increasing daylength, but decreased with increasing stature. The model predicted LER without bias for 16 of the cultivars, but slightly over-predicted LER in winter for the only representative of the Gros Michel subgroup (Highgate).Examination of independent data from South Africa revealed that LER decreased with increasing plant density. After the LER model had been adjusted for this effect, it gave an excellent prediction of LER for 229 observations in 20 additional data subsets from Alstonville, Innisfail (Queensland), Burgershall (South Africa) and Azaguie (Ivory Coast), with LERobs = (1.03 � 0.04) LERpred. - (0.005 � 0.004) and coefficient of determination of 0.71. After pooling all 841 observations into one data set, the coefficients of all five factors of the LER model were re-estimated. There were only minor revisions to the coefficients previously obtained, but LER was predicted with slightly greater precision than in the validation test above.

Growth, radiation use efficiency and yield potential of enset (Ensete ventricosum) at different sites in southern Ethiopia

“…At Awassa and Areka, the leaf appearance rate increased in the first 210 days and then switched to a lower value. This result seems to agree with the findings of Allen et al (1988) on banana who reported that leaf appearance rate increased during the establishment phase of the plants and then, after 64 days, decreased with increasing time. Leaf appearance rate of enset has not ever been reported before.…”

“…The observations on maximum LAI (3.2-4.6) compared well with LAI of 4.8 reported by Turner (1972b) and 3.2-4.3 reported by Stover (1982) for banana. on banana obtained by Allen et al (1988), Eckstein & Robinson (1995) and Eckstein et al (1997).…”

Bananas and Plantains

“…We will explore these processes because they are of immediate practical interest. The work of Allen et al (1988) shows that photoperiod, plant stature (as influenced by cultivar) and plantation density also influence the rate of appearance of new leaves. When combined with the total number of leaves to be produced it can give an estimate of the time of bunch emergence for any given planting date.…”

“…The factors influencing leaf emergence rate of the Cavendish and Gros Michel sub-groups include air temperature, day length, plantation age, plant density and plant stature (Allen et al, 1988).…”

Safety Assessment of Transgenic Organisms, Volume 4

“…The leaf blade (up to 2 m 2 ) normally is transversely split (by wind) between parallel veins, which assists cooling and photosynthesis (Karamura and Karamura, 1995). Leaves are produced successively until the single inflorescence is cast (Allen et al, 1988), and are present in variable number (10 to 20 under healthy conditions) depending on the variety, the climate and cultivation practices. Each leaf takes 7-14 days to emerge (Turner et al, 2007).…”